http://www.mindat.org/msgboard-82.html Thu, 23 May 2013 04:27:12 +0000 Phorum 5.2.15a http://www.mindat.org/forum.php?read,82,225739,292519#msg-292519 http://www.mindat.org/forum.php?read,82,225739,292519#msg-292519 Those are interesting and now in the article. Can you tell us something about the occurrence?]]> Rock Currier Best Minerals P Mon, 29 Apr 2013 06:35:58 +0000 http://www.mindat.org/forum.php?read,82,225739,292507#msg-292507 http://www.mindat.org/forum.php?read,82,225739,292507#msg-292507 John Sobolewski Best Minerals P Mon, 29 Apr 2013 00:43:32 +0000 http://www.mindat.org/forum.php?read,82,225739,292503#msg-292503 http://www.mindat.org/forum.php?read,82,225739,292503#msg-292503 You are right, those snuck past me. Thanks for bringing them to my attention. I put all three in the article. Neat specimens. I never saw one for sale. Did you collect them? How many were found?]]> Rock Currier Best Minerals P Sun, 28 Apr 2013 22:57:16 +0000 http://www.mindat.org/forum.php?read,82,225739,292447#msg-292447 http://www.mindat.org/forum.php?read,82,225739,292447#msg-292447 www.mindat.org]]]> Reiner Mielke Best Minerals P Sun, 28 Apr 2013 12:56:53 +0000 http://www.mindat.org/forum.php?read,82,202977,292401#msg-292401 http://www.mindat.org/forum.php?read,82,202977,292401#msg-292401 Thanks you so much, and I really mean that, for your carefully reasoned and explained reasons for giving the image a better locality. So often someone posts something like. Image X is not correct, it should be Y. Their correction could very well be correct, but the poor expert/manager/moderator often does not have a clue if this is true or not. If everyone suggesting changes would explain exactly why they believed something should be changes it would make our jobs here on mindat so much easier. Based on your detailed response I was able to think. Certainly that's right. So I have changed the locality on the image and in the Best Minerals article. Thanks again.]]> Rock Currier Best Minerals P Sat, 27 Apr 2013 19:09:46 +0000 http://www.mindat.org/forum.php?read,82,202977,292374#msg-292374 http://www.mindat.org/forum.php?read,82,202977,292374#msg-292374
You have listed one of your photos (added on 2nd May 2010) showing a 6cm Kaolinite after Orthoclase pdeudomorph from the Keith Harshberger collection in the 'Pseudomorphs and Replacements J to M'.
The caption claims that the specimen is from the Slip China Stone Quarry, St. Dennis, St. Austell District, Cornwall. UK, and the image has the reference ID 302068.
I would opine that it is not possible that the specimen originated from Slip China Stone Quarry, the reason being that the quarry lies in the small Fluorite Granite area totally within the nonmegacrystic Lithium Mica Granite of the St. Austell Granite Mass. To my knowledge no megacrysts have been noted from there. There are two major megacrystic zones in the St. Austell Granite Mass, one a lobe in the far west, and a much larger area spanning most of the centre and eastern parts. The specimen illustrated is from one of those two zones.
As it is not possible to designate a specific china clay pit or quarry as its origin, I suggest that the caption should delete Slip China Stone Quarry, and read 'St. Austell District, Cornwall, UK..
Furthermore, the Slip China Stone Quarry lies within the parish of St. Stephen-in-Brannel and not St. Dennis as stated.

Courtenay V Smale]]> Courtenay Smale Best Minerals P Sat, 27 Apr 2013 10:37:25 +0000 http://www.mindat.org/forum.php?read,82,207865,292157#msg-292157 http://www.mindat.org/forum.php?read,82,207865,292157#msg-292157 Thanks for uploading those images. They are really interesting and Ill use them once we, or rather you get the new locality entered in Mindat. I know the first time around this may seem a little hard to do, but the fact that you managed to upload some images indicates a degree of computer literacy.

To enter new localities in Mindat, you need to do that from the locality pages, not the photo upload page. In you case you will need to go to the Alberta locality page:

[www.mindat.org]

And then click on the Edit/Add Sub Locality menu choices. I think you should be able to figure it out from there. Once the locality has been entered, you will be able to go back to your images and find the correct locality already in the system, select it and update the data on the photo upload page. Let me know if you have any problems.

To get to Alberta, just go to the locality field at the bottom of any page in type in Alberta.]]> Rock Currier Best Minerals P Wed, 24 Apr 2013 20:05:59 +0000 http://www.mindat.org/forum.php?read,82,207865,292095#msg-292095 http://www.mindat.org/forum.php?read,82,207865,292095#msg-292095
Thanks,
Volkmar]]> Volkmar Stingl Best Minerals P Wed, 24 Apr 2013 01:11:53 +0000 http://www.mindat.org/forum.php?read,82,207865,292080#msg-292080 http://www.mindat.org/forum.php?read,82,207865,292080#msg-292080
I've now uploaded the 5 images of my chalcedony pseudos, but had some difficulty accessing and using the Photo Upload form.
In particular I was unable to enter a new locality, so please note that three of the specimens (my catalogue nos. MC16, UL1 and DW51), are from a new locality, as follows:

Battle River, northeast of Donalda, Alberta, Canada.

The minerals found at this location are:
-Chalcedony
-Quartz
-Calcite

For the Drumheller locality, you can also add Gypsum to the minerals list (crystals on specimens that I've collected)

The literature reference for both locations( Drumheller, and Battle River) is as follows:

Menzies, M.A., and Frazier, S. (2012) Unusual quartz and chalcedony pseudomorphs from Canada’s Alberta badlands. Rocks & Minerals, 87, 6, 512-521.


Would it be possible for you to make the changes?


Thanks,

Mike]]> Mike Menzies Best Minerals P Tue, 23 Apr 2013 23:09:51 +0000 http://www.mindat.org/forum.php?read,82,207865,291843#msg-291843 http://www.mindat.org/forum.php?read,82,207865,291843#msg-291843 Before I can put an image in a Best Minerals article, they must be formerly uploaded to Mindat's database. Would you like to do that? Do you need instructions on hot to do it? The reason for this is to clear up copyright issues regarding the photos and to make it accessible to anyone searching for that mineral on mindat.]]> Rock Currier Best Minerals P Sun, 21 Apr 2013 02:34:55 +0000 http://www.mindat.org/forum.php?read,82,207865,291824#msg-291824 http://www.mindat.org/forum.php?read,82,207865,291824#msg-291824
I can add 2 pictures of quartz pseudomorphs from a Chinese locality. The quality of the pictures is not very good, but I think these are interesting additions regarding the locality. If you want, you can use the pictures.
Both pieces are self-collected in 2012 resp. 2013 in Yongping Cu-mine, Shangrao Pref., Jiangxi Prov., PR China.

Volkmar

Quartz var. Chalcedony ps. calcite on fluorite (width about 4 cm, find from 2012-12-02)
[attachment 45116 121202Yongping10a.JPG]

Quartz ps. fluorite (width about 7 cm, find from 2013-01-13)
[attachment 45117 130113Yongping03.JPG]]]> Volkmar Stingl Best Minerals P Sat, 20 Apr 2013 22:31:54 +0000 http://www.mindat.org/forum.php?read,82,207865,291811#msg-291811 http://www.mindat.org/forum.php?read,82,207865,291811#msg-291811 Rock Currier Best Minerals P Sat, 20 Apr 2013 17:16:26 +0000 http://www.mindat.org/forum.php?read,82,207865,291804#msg-291804 http://www.mindat.org/forum.php?read,82,207865,291804#msg-291804
For additional info on Chalcedony pseudomorphs after what are believed to be Melanophlogite, see my article "Unusual Quartz and Chalcedony Pseudomorphs from Canada's Alberta Badlands" in the Nov / Dec 2012 issue of Rocks & Minerals.

I can supply photos, including but not limited to those in the article.

Some of these pseudos take a plate-like form similar to Patrice Cmolik's specimen from Auvergne, Puy-de-Dôme, Pont-du-Château, France that's already in your article. The Alberta specimens are, however, less gemmy.

Cheers,

Mike]]> Mike Menzies Best Minerals P Sat, 20 Apr 2013 15:37:54 +0000 http://www.mindat.org/forum.php?read,82,202977,291793#msg-291793 http://www.mindat.org/forum.php?read,82,202977,291793#msg-291793 Yes, it is worthy of being added to the article. I have added it in the section containing the D pseudomorphs.]]> Rock Currier Best Minerals P Sat, 20 Apr 2013 09:56:39 +0000 http://www.mindat.org/forum.php?read,82,202977,291782#msg-291782 http://www.mindat.org/forum.php?read,82,202977,291782#msg-291782

http://www.mindat.org/photo-516417.html	© Madmineralz

]]> Michael Hopkins Best Minerals P Sat, 20 Apr 2013 01:24:19 +0000 http://www.mindat.org/forum.php?read,82,202970,285579#msg-285579 http://www.mindat.org/forum.php?read,82,202970,285579#msg-285579
[www.mindat.org]]]> Karsten Ivan Best Minerals P Sun, 17 Feb 2013 12:24:02 +0000 http://www.mindat.org/forum.php?read,82,278953,280068#msg-280068 http://www.mindat.org/forum.php?read,82,278953,280068#msg-280068 Ill look forward to your pictures.]]> Rock Currier Best Minerals P Sun, 23 Dec 2012 19:56:26 +0000 http://www.mindat.org/forum.php?read,82,190170,280067#msg-280067 http://www.mindat.org/forum.php?read,82,190170,280067#msg-280067 Rock Currier Best Minerals P Sun, 23 Dec 2012 19:55:22 +0000 http://www.mindat.org/forum.php?read,82,190170,280056#msg-280056 http://www.mindat.org/forum.php?read,82,190170,280056#msg-280056
The real issue with French creek material is the matrix itself and the treatment many specimens have endured. Most have been treated with acid, etched out of Calcite, and it would seem many have not been properly processed afterwards (cleaned/soaked) and have gotten quite friable over these many years, some simply falling apart, however even on these, the Pyrite xtls themselves still remain as bright and stable as ever.

Again, having handled hundreds of specimens from this locale over many years myself, and know many others who have as well, and I have yet to see or hear of one suffering from pyrite disease. If one ever has, it is at least certainly NOT at all common.


MRH]]> Mark Heintzelman Best Minerals P Sun, 23 Dec 2012 18:41:17 +0000 http://www.mindat.org/forum.php?read,82,278953,280038#msg-280038 http://www.mindat.org/forum.php?read,82,278953,280038#msg-280038 -------------------------------------------------------
> Denis,
> I have added two more of your prehnite specimens
> to the article. Why would we not want you prehnite
> images in our gallery? Every day there are images
> less worthy than yours added to our gallery.

I know there a lot of place in the world or there are very nice prehnite and as the article is called "the best prehnite" is not for me to decide whether my samples can have their places here and I don't want to spoil a good topic like this.



> You say that the picture was taken in a shallow 5
> meter long tunnel. Was this tunnel made while
> collecting prehnite specimens? Can you tell us
> something about the geology of the locality? How
> many specimens has this locality produced over
> what length of time? Are there better specimens
> than those currently shown in our article?

This tunnel was dig in amphibolite rock just for collecting prehnite. There was collected an hundreds of pretty good specimens . I have better spécimens than the last picture. I'm trying to make pictures that i'll adding in my page.

Have a good sunday,
Denis

]]> Denis Mantel Best Minerals P Sun, 23 Dec 2012 13:57:22 +0000 http://www.mindat.org/forum.php?read,82,278953,280017#msg-280017 http://www.mindat.org/forum.php?read,82,278953,280017#msg-280017 I have added two more of your prehnite specimens to the article. Why would we not want you prehnite images in our gallery? Every day there are images less worthy than yours added to our gallery. You say that the picture was taken in a shallow 5 meter long tunnel. Was this tunnel made while collecting prehnite specimens? Can you tell us something about the geology of the locality? How many specimens has this locality produced over what length of time? Are there better specimens than those currently shown in our article?]]> Rock Currier Best Minerals P Sun, 23 Dec 2012 09:12:17 +0000 http://www.mindat.org/forum.php?read,82,278953,279954#msg-279954 http://www.mindat.org/forum.php?read,82,278953,279954#msg-279954 -------------------------------------------------------
> Denis,
> Was that picture of the prehnite on the rock face
> a picture taken on the wall of rock outside or in
> a mine tunnel?

It's in a small tunnel (5 meters depth)

The picture of the specimen is
> pretty good. Why don't you upload them to our
> gallery rather then as an attachment to an thread
> posting? Do you know how to do it?

OK, I added it in my galery.
If you think that this picture should not be here, you can remove it.

Denis:-)]]> Denis Mantel Best Minerals P Sat, 22 Dec 2012 15:27:09 +0000 http://www.mindat.org/forum.php?read,82,278953,279925#msg-279925 http://www.mindat.org/forum.php?read,82,278953,279925#msg-279925 Was that picture of the prehnite on the rock face a picture taken on the wall of rock outside or in a mine tunnel? The picture of the specimen is pretty good. Why don't you upload them to our gallery rather then as an attachment to an thread posting? Do you know how to do it?]]> Rock Currier Best Minerals P Sat, 22 Dec 2012 12:12:06 +0000 http://www.mindat.org/forum.php?read,82,278953,279888#msg-279888 http://www.mindat.org/forum.php?read,82,278953,279888#msg-279888
Congratulations for this good job about prehnite all the world.

To day I show you prehnite pocket near "La Combe de la Selle", in Oisans, (France).
You can see prehnite and byssolite half covered by fossil ice.
[attachment 42857 IMGP1962a.JPG]

In the second picture is a prehnite (7 x 5cm) come from this pocket.
[attachment 42858 prehflab08-5.jpg]

Best regards,

Denis.]]> Denis Mantel Best Minerals P Fri, 21 Dec 2012 23:00:08 +0000 http://www.mindat.org/forum.php?read,82,279158,279158#msg-279158 http://www.mindat.org/forum.php?read,82,279158,279158#msg-279158 Best Minerals and here for Tourmaline group minerals, here for Chromium-dravite, here for Chromo-alumino-povondraite, here for Dravite, here for Elbaite, Afghanistan to Nigeria, here for Elbaite, Pakistan to Zambia here for Feruvite, here for Fluor Buergerite here for Fluor-dravite, here for Fluor-elbaite, here for Fluor-feruvite, here for Fluor-liddicoatite, here for Fluor-schorl, here for Foitite, here for Liddicoatite, here for Luinaite-(OH), here for Magnesiofoitite, here for Olenite, here for Oxy-dravite, here for Oxy-rossmanite, here for Oxy-schorl, here for Povondraite, here for Rossmanite, here for Schorl, here for Tsilaisite and here for Vanadium-dravite. Click here for Best Minerals T and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?



Povondraite: Trigonal
Na(Fe³⁺₃)Mg₂Fe³⁺₄(Si₆O₁₈)(BO₃)₃(OH)₃O

Povondraite 7cm, Cristalmayu, Alto Chapare District, Bolivia	© Alfredo Petrov

There are 8 localities listed on Mindat for povondraite. The type locality for povondraite is Cristalmayu valley, Cristalmayu, Cristalmayu subdistrict, Alto Chapare District, Chapare Province, Cochabamba Department, Bolivia



Bolivia, Cochabamba Department, Chapare Province, Alto Chapare District, Cristalmayu subdistrict, Cristalmayu, Cristalmayu valley

Povondraite, FOV 7mm	© Elmar Lackner 2009

Povondraite xl 1cm	© Knut Eldjarn

Povondraite FOV 5mm	© 2008 Jesse Crawford

The locality is covered in jungle and the specimens are from the cap of a salt dome. There are few roads in the region and the mountains steep. Occasionally there are land slides on the steep mountain sides and fresh rock is exposed and these areas are usually productive of specimens. Small gray doubly terminated danburites up to two inches are common.





Click here to view Best Minerals and here for Tourmaline group minerals, here for Chromium-dravite, here for Chromo-alumino-povondraite, here for Dravite, here for Elbaite, Afghanistan to Nigeria, here for Elbaite, Pakistan to Zambia here for Feruvite, here for Fluor Buergerite here for Fluor-dravite, here for Fluor-elbaite, here for Fluor-feruvite, here for Fluor-liddicoatite, here for Fluor-schorl, here for Foitite, here for Liddicoatite, here for Luinaite-(OH), here for Magnesiofoitite, here for Olenite, here for Oxy-dravite, here for Oxy-rossmanite, here for Oxy-schorl, here for Povondraite, here for Rossmanite, here for Schorl, here for Tsilaisite and here for Vanadium-dravite. Click here for Best Minerals T and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


[The first draft of the Best Minerals article on povondraite was finished in May 2013]]]> Rock Currier Best Minerals P Fri, 14 Dec 2012 11:55:48 +0000 http://www.mindat.org/forum.php?read,82,278953,278953#msg-278953 http://www.mindat.org/forum.php?read,82,278953,278953#msg-278953 Prehnite USA. Click here to view Best Minerals P, click here to view and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.



Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?



Prehnite
Ca₂Al₂Si₃O₁₂(OH) Orthorhombic

Prehnite Crystal, doubly terminated ~4cm Asbestos, Quebec, Canada	©

Usually prehnite is found as a botryoidal bubbly green mineral and there are plenty of examples of this kind of prehnite below. Sometimes however it is found in fine sharp crystals, but those are not common and are probably best exampled by specimens from Asbestos, Quebec, Canada like the one pictured above. Most collectors unless they have seen some of these relatively rare crystals would not even be able to identify them as prehnite. So what are the best prehnite specimens? I am partial to the wonderful crystals from Asbestos, Quebec, but then when I see some of the great prehnite snake head casts from Lower New Street quarry I think, well perhaps those are the best. Then there are the amazing balls of orange crystals from the Manganese mines near Kuruman in South Africa and then some of the fine combinations of Prehnite and Epidote crystals from the recent find in Mali are pretty amazing as well. More recently some amazing specimens of crystallized prehnite have been found with Zoesite var. tanzenite and other minerals. I guess Ill just have to get some of all of those. Fine examples of these and many more you can see below. I wish I had them all. Remember the mantra of all good collectors! "Everything is not nearly enough."

It is interesting to note that nearly half the specimens and localities of prehnite shown here are in the United States. This has probably more to do with The United States being a relatively large country and that the people living there are rich enough to be able to afford to spend time and money on their hobbies. It also helps that some of the most prolific prehnite localities are located in New Jersey which is the most densely populated state in the USA.

Prehnite, when it is found is often plentiful, especially in basalts of the Watchung mountains in New Jersey where it is found in seemingly endless variety with other “zeolite” type minerals. One old time collector in New Jersey told me that on a good day he could drive his pickup (truck) into the Park (Prospect Park Quarry (Sowerbutt Quarry; Vandermade Quarry; Warren Brothers Quarry) and fill it up with prehnite specimens that lay scattered about in the blast pile. I have collected in this quarry on a good day and you could look around the quarry (you looked only in the upper most walls because the lower basalts were almost always barren) and I could count ten or twenty open pockets. Only the occasional pocket had great specimen in it but when each blast produced that many pockets you know that wonderful things were produced from time to time.

Other localities, like the alpine vein kind of localities often produce fine prehnite specimens, but they are very stingy compared to the basalt localities. However many basalts don’t have any prehnite to speak of at all. Like most of the zeolitic basalt locations in India or in northern Uruguay or southern Brazil. Almost all the prehnite specimens produced in the Deccan basalts is found near Bombay, almost exclusively at the quarry known as Malad. The Uruguayan and Brazilian basalts, though famous for their abundant amethyst specimens have few other associated minerals occurring in their amygdaloidal cavities. Sometimes skarn deposits produce abundant prehnite specimens. Most notably are the specimens from the Kays region of Mali that has produced literally tons of prehnite. Most of this prehnite has been sent in containers to the lapidary factories in China for conversion into beads and carvings. Ultimately much of it probably gets sold off as “jade” to unsuspecting customers who have never heard of Prehnite, but have heard of Jade.

Prehnite is also a very tough mineral and will even survive pretty much intact in a blast pile. When I got my first shipments of prehnite specimens from Mali, they were not individually wrapped but rather thrown all jumbled together in big burlap bags. I thought most of them would be ruined beyond redemption by this rough treatment and watched with dismay as the first bag full was dumped onto the cleaning screens. To my amazement, after pressure washing and cleaning with an air abrasive tool using glass beads (hardness of about 5.5) the prehnite looked almost untouched and it was rare to find one that appeared to be damaged. You almost have to hit one directly with a hammer to cause it much damage. If you so much as look at some minerals like barite, they seem to break, but prehnite is a tough customer. Who says you can’t teach an old dog new tricks.

Prehnite is a mineral that has been known for a long time. It was named after Colonel Hendrick von Prehn (1733-1785) who discovered the mineral near the Cape of Good Hope in South Africa. I am not sure if anyone even knows where this locality is today or if the type material was ever saved. It has other names other than Prehnite. Sage called it chrysotile and Rome' de Lisle assigned it to the schorl group in 1783. Werner gave it the name Prehnite in 1790 and that name has stuck with us so far. Because of the almost universal twinning of Prehnite, the crystal structure of the mineral was not resolved till 1990 on Prehnite from Komiža, Vis Island, Split-Dalmatia County, Croatia. The Handbook of Mineralogy says the largest crystals are 4 cm, but I have seen larger ones from Asbestos, Quebec though they are not all that sharp.
1.Crystal structure of prehnite: Zunic, T.B., S. Scavnicar, and G. Molin (1990 Crystal structure of prehnite from Komiza. Eur. J. Mineral., 2, 731-734.
[Rock Currier 2009]


Prehnite
Australia
New South Wales, Cumberland Co., Prospect (Prospect Hill), Prospect Quarry

Prehnite ~10cm wide	©

Prehnite ~6cm wide	©

Prehnite & Analcime ~7cm wide	©

Prehnite & Quartz, 2.2cm tall	© Earthstones

The quarry has produced specimens over a long period of time and large specimens are not uncommon. I have heard Australian collectors comment that it was hard to get good small ones.


Prehnite
Australia
New South Wales, Gowen Co., Coonabarabran

Prehnite, 12.3cm wide	© finestminerals.com

Prehnite
Australia
Gunnedah, Pottinger Co., New South Wales

Prehnite, 7.7cm wide	© JSS

Prehnite
Australia
New South Wales, Pottinger Co., Mullaley

Prehnite, 12.5cm wide	© Mark Rheinberger

Prehnite, 7.5cm wide	© Greg Andrew

Prehnite, 5.3cm wide	© JSS

Prehnite, 7.5cm tall	© Mark Rheinberger09

Prehnite
Australia
Tasmania, Tasmania, Tasmania

Prehnite xls. 6mm wide	© crocoite.com

Prehnite
Austria
Carinthia, Koralpe Mts, Kamp, Fraßgraben

Prehnite, 8.5cm wide

A pretty ugly prehnite. I wonder if better are produced at this locality. We need someone to tell us about them.


Prehnite
Austria
Salzburg, Hohe Tauern Mts, Habach valley

Prehnite on Quartz, 8cm wide	©

Prehnite, 6cm wide	©

Prehnite, 13 cm wide	© Rob Lavinsky

Prehnite, 6cm wide	©

Prehnite, 17.4cm tall	© Rob Lavinsky

There are a number of prehnite localities in the Habach valley that produce prehnite and among those pictured here are: Breitfuß Mt. - Großer Finagl Mt. area; Großer Finagl Mt., Gamsmutter Mt. (east slope); Kratzenberg Mt., Prehnite Island and Teufelsmühle. To know somewhat more precise localities, just click on the image of your choice and read the complete captions when the full size image appears.


Prehnite
Austria
Salzburg, Hohe Tauern, Untersulzbach valley, Wartköpfe (Waschköpfe)

Prehnite 7cm wide	© Stefan Koch

Prehnite
Austria
Styria, Stubalpe Mts, Hennereben, Roßbachgraben

Prehnite, 8.5cm wide	©

Prehnite
Canada
Québec, Richmond Co., Shipton Township, Asbestos, Jeffrey Mine (Jeffrey Quarry)

Prehnite xls. ~4cm wide	©

Prehnite, 4.1cm wide	©

Prehnite, ~7cm wide	©

Prehnite, 4.3cm wide	© Rob Lavinsky

Prehnite ~7cm across	©

Prehnite, 9cm wide	©

Prehnite & Vesuvianite, ~5cm tall	©

Prehnite, ~7cm tall	©

Prehnite xls. ~8cm wide	©

Prehnite, ~2.5cm wide	©

Prehnite, (stilbite look alike) ~7cm wide	©

Prehnite, ~7cm wide	©

Prehnite, ~7cm across	©

Prehnite & Diopside 3.6cm wide	© Rob Lavinsky

Prehnite & Grossular 7cm wide	© Rob Lavinsky

The big open pit asbestos mine at Asbestos, Quebec on occasions gobbled up bits of the town as they either slid into it or had to be moved to accommodate mining. Eventually, health concerns related to the use of asbestos caused a great decline in demand for asbestos and the mine to became unprofitable. It is now closed. But during its operation, the mine produced some of the finest specimens of grossular garnets thus far found. In addition, but well less known, were world class specimens of Prehnite, Vesuvianite, Pectolite and other minerals. In the case of Prehnite I believe Asbestos has produced the best examples of crystallized prehnite in the world. The Hnadbook of Mineralogy, Anthony et. al. sites the largest Prehnite crystal as being 4 cm but I saw one crystal, from the same pocket as the one at the lower left above that measured 10 cm and I doubt that I saw the largest. The sharp, steep pyramidal crystals shown above an the one at the lead in of this article may be the best well crystallized prehnite found to date. I used to have fun running sight identification contests where I would show five or six substantially different, but well crystallized examples of Prehnite from Asbestos and no one would ever guess what they were let alone where they were from. Then I would sit back and enjoy the groans when my victims found out that they were all prehnite specimens from Asbestos. There was one good size pocket, perhaps the size of a bushel basket that produced most of the well crystallized prehnites with steep bipyramids with pointed tips. Perhaps three or four flats of material in all. They were collected by the mine geologist, Francisco Spertini and though not colorful, I think they were the best specimens of crystallized prehnite found to date.
[Rock Currier 2009]


Prehnite
Canada
Yukon Territory, Mayo Mining District, Hart River, Grey Cloud Claim

Prehnite 5cm wide	©

Prehnite
China

Prehnite, ~8cm in diameter	©

This giant ball of stilbite is in the British Museum of Natural history. When I first saw it I didn't believe it was real, but it is. The only locality the keeper of minerals had was that it was from China. I hope by including it here that someday someone will be able to tell me where it is from exactly.


Prehnite
China
Sichuan Province, Liangshan Autonomous Prefecture, Meigu Co., Ganzhizhou Mine

Prehnite & Quartz 4.3cm wide	© Rob Lavinsky

Prehnite
China
Sichuan Province, Liangshan Autonomous Prefecture, Meigu Co., Hongquizhen Quarry

Prehnite & Quartz, 4cm wide	© JSS

Prehnite & Quartz, 7.2cm wide	© JSS

Prehnite, 4.6cm wide	© Safaa Yu

Prehnite & Quartz, 5.4cm wide	© Rob Lavinsky

Prehnite & Quartz, 7.4cm wide	© Rob Lavinsky

Prehnite & Chrysocolla, 5.4cm	© Rob Lavinsky

Prehnite, Epidite & Quartz, 5.9cm wide	© Rob Lavinsky

Prehnite & Babingtonite 9.8cm wide	© Rob Lavinsky

Prehnite & Chrysocolla 8cm wide	© Jose Zendrera

Prehnite, Chrysocolla & Quartz 8.2cm tall	© Lavinsky

Prehnite 5.7cm wide	© Eric Graff

© Jose Zendrera

Prehnite, Babingtonite & Quartz 8.5cm center	© A&M

Prehnite
China
Yunnan Province, Zhaotong Prefecture, Qiaojia, Co., Babingtonite occurrences

Prehnite & Quartz, 10cm wide	© Rob Lavinsky

Prehnite, Quartz & Babingtonite 4.5cm	© Jiangbin

Prehnite, Babingtonite & Quartz 7.1cm wide	© Millan

Prehnite & Quartz, 5.5cm	© Jiangbin

.

Prehnite & Babingtonite 11.0cm wide	© Weinrich

Prehnite & Babingtonite 6cm wide	© Fabre

Prehnite & Babingtonite 4.2cm wide	© Guoliang Sun

We need someone to tell us about the specimens from this locality. There appear to be at least too good localities for prehnite in China and I know at least one of them produces abundantly. I have been offered two or three lots of them and each lot had several hundred specimens of Prehnite/Quartz combinations.


Prehnite
Czech Republic
Bohemia (Böhmen; Boehmen), Central Bohemia Region, Čáslav (Tschaslau), Markovice

Prehnite 13cm wide	© Weinrich Minerals, Inc.

Prehnite
France
Rhône-Alpes, Isère, Bourg d'Oisans

Prehnite, 8cm tall	© Paul De Bondt

Prehnite, ~8cm wide	©

Prehnite, ~6cm tall	©

Prehnite, 6.4cm wide	© Paul De Bondt

Prehnite 5.7cm tall	© Dan & Diana Weinrich Minerals

Prehnite
France
Rhône-Alpes, Isère, Bourg d'Oisans, St Christophe-en-Oisans, La Combe de la Selle

Prehnite & Calcite etc. 5.5cm wide	© Denis Mantel

Prehnite 7cm wide	©

Prehnite 3.4cm wide	© Weinrich Minerals, Inc.

Prehnite 7cm wide	© Arliguie M

Prehnite, 7cm wide	© Denis Mantel

Prehnite 5.5cm wide	© Denis Mantel

Collecting at La Combe de la Selle	©

Prehnite
Germany
Lower Saxony, Harz Mts, Bad Harzburg

Prehnite, ~9cm wide	©

Prehnite
Georgia
Adjaria Autonomous Republic

Prehnite 4cm tall	© redcrystalshop

Prehnite
Germany
Lower Saxony, Harz Mts, St Andreasberg District, St Andreasberg

Prehnite, 7cm wide	© 2002 John H. Betts

Prehnite
Germany
Rhineland-Palatinate, Palatinate, Otterberg, Niederkirchen, Rauschermühle Quarry

Prehnite, 9.5cm wide	© Rob Lavinsky

Prehnite, 5cm wide	© Volker Betz

Prehnite 8cm wide	© Weinrich Minerals, Inc.

Prehnite
Germany
Rhineland-Palatinate, Wolfstein, Kreimbach-Kaulbach, Andesite quarry

Prehnite, 2.8cm wide	©

Prehnite
Germany
Saxony-Anhalt, Harz Mts, Wernigerode, Schierke, Wormke bend

Prehnite, 9cm wide	© 2001 John H. Betts

Prehnite
India
Maharashtra, Mumbai District (Bombay District), Mumbai (Bombay), Ward 38, Malad, Malad Quarry (Kandivali Quarry)

Prehnite @ laumontite 23.6cm wide	© Lavinsky

Side view of left	© Rob Lavinsky

Prehnite after Laumontite, 4.5cm wide	© 2001 John H. Betts

Prehnite & Gyrolite ~5cm wide	©

Prehnite & Laumontite ~4cm tall	©

Prehnite & Gyrolite ~10cm tall	© Tony Peterson

Prehnite after Laumontite, 9.4cme	© Rob Lavinsky

Prehnite after Laumontite 11cm wide	© G. van der Veldt

Prehnite @ laumontite 12cm	© Weinrich

Prehnite @ laumontite 10.7cm wide	© Weinrich

Prehnite is a rare mineral in the Deccan trap rocks of India except at Malad where is is common as pale, almost white little hemispheres growing on quartz and other minerals in the amygdaloids (pockets) of it's pillow basalts. The small blebs of prehnite can be easily be mistaken for small balls of Gyrolite but if you look carefully at them they have a greater degree of translucency and often a very pale green color where as the balls of Gyrolite are more opaque white or cream color. It is a rare prehnite specimen from Malad that has a good green color. It is not uncommon to find pale green prehnite "sticks" of prehnite, usually growing in clusters that are casts after prismatic laumontite. I have a few specimens in my collection where the laumontite is still intact inside these casts. Initially they were thought to be casts after anhydrite like the casts after anhydrite that are common in the quarries of the Watchung basalts in New Jersey. Most of the amygaloidal cavities that produced the specimens for which the quarry is well known are smaller than a wash tub, but back in the late 60s a large walk in pocket lined with prehnite casts was found. It was large enough that you could almost stand upright in it. Many of the cast clusters were coated with a black material that was later found to be a very pure form of Todorokite which I found much to my delight could be easily removed with a slightly acidified solution of hydrogen peroxide. Also much to my profit, because the dirty black cast clusters were purchased for very little money. Some times these casts had other minerals growing on them, most commonly blocky crystals of Apophyllite-(KOH). Malad has probably produced the worlds best specimens of this variety of apophyllite as well as the best specimens of Okenite, Gyrolite and Yugawaralite. The specimens from Malad are almost always found growing on small drusy white quartz crystals that commonly line the pockets and the assemblage is distinctive enough that once you are familiar with it, you can always spot a specimen from Malad.

The quarries are located not far from the main north/south railway line that connects Bombay to the mainland. They are located just three kilometers east of the town of Malad and its railway station. You can see them easily from satellite images. In the 60s this part of northern Bombay was almost rural and those who dealt in specimens from there would get off the train at the Malad station and walk or take what ever transport they could command and travel to the quarries. If however you had a car you would most likely travel to the next little town Kandivili (Kandivili) and then back track a little to get to the quarries because there was no road directly from Malad to the quarries. For this reason the name Kandivili or Kandivili became attached to the quarries. They were also by some dealers called the Bombay quarry. There were seven quarries and they were numbered from south to north. When facing the quarries looking east, the number one quarry was the furthest one south or to your right. The number 2 quarry was where almost all of the Yugawaralite specimens came from. Over the years, the quarries more or less worked into each other and so the quarry numbers are not very meaningful. Today the quarries are not active and it is an area of slum housing.
[Rock Currier 2009]


Prehnite
Italy
Aosta Valley, Champdepraz, Monte Barbeston

Prehnite 4.8cm wide	©

Prehnite, 13 cm wide	© Marco Macchieraldo

Prehnite
Italy
Piedmont, Torino Province, Sesia-Lanzo zone, Lanzo Valley, Viù Valley, Usseglio, Margone

Prehnite, 2.1cm wide	© Rob Lavinsky

What a lovely little specimen!


Prehnite
Italy
Trentino-Alto Adige, Trento Province, Fassa Valley, Duron Valley, Col Rodella

Prehnite, ~2.5cm wide	© Chinellato Matteo

Prehnite
Italy
Veneto, Vicenza Province, Recoaro Terme, Civillina Mt.

Prehnite & Rhodochrosite ~13cm	© Gianfranco Capolupi

Prehnite
Kazakhstan
Zhezqazghan Oblysy (Dzezkazgan Oblast'; Dzhezkazgan Oblast'; Djezkazgan Oblast'; Jezkazgan Oblast')

Prehnite	© Rob Lavinsky

Prehnite
Kazakhstan
Kostanay Province (Qostanay Oblysy; Kostanai Oblast'), Kostanay (Qostanay; Kustany), Kurzhunkul' (Karzamkul) deposit

Prehnite & Calcite 3cm wide	© Igor Savin

Prehnite 2.7cm wide	© Igor Savin

Prehnite
Mali
Kayes Region, Bafoulabé Circle, Bendoukou village (Benduko village), Djouga diggings (Jjouga; Djouga-Kalon)

Prehnite, 15.5cm high	©

Prehnite on Epidote 6.8cm tall	©

Prehnite cast, 13.4cm tall	©

Prehnite balls 2 to 2.7cm	©

Prehnite @ anhydrite 10cm tall	©

Back side of left	©

Prehnite ~10cm tall	©

Prehnite & Stilbite ~7cm wide	©

Prehnite 5.8cm wide	© Oleg Lopatkin

The prehnite, epidote and garnet specimens from Mali all derived from the discovery of green grossular garnets in the Kays region of Mali back in 1994, It was reported in the newspapers that emeralds had been discovered. There was a gem rush of sorts that in a small way resembled the early gold rushes in California and other places and at one time there were several thousands of locals digging for these "emeralds". It was soon discovered that they were garnets and not emeralds, but it got a lot of people digging for stuff. Soon these diggers started looking at other near by skarn deposits that conveniently outcropped on the sides of many hills in the region and in addition to garnets of various colors they found prehnite and epidote specimens. Perhaps the best and most prolific of the prehnite localities were the hillside diggings about five kilometers north of Bendoukou village in the Kays region of Mali. Local diggers started producing tons of Prehnite which sometimes contained a good portion of nice specimen material. This material was taken to Bamako, the capitol of Mali and from there sold to whoever would pay the best price. Most of the material was put in containers and sent to China as fodder for their big Lapidary factories to be turned into beads and small carvings of various kinds. Over several years we bought several thousand pounds of prehnite, garnet and epidote specimens and the best of them were really spectacular. Especially desirable were the combination pieces of black epidote crystals with balls of green prehnite growing on them. Many of the prehnite specimens were in the form of complete balls of Prehnite or several of these balls that had grown together. As time passed other localities for prehnite and garnets were found in the various skarns of the region and I am sure as more time passes, there will be more localities that will each produce a somewhat different flavors of prehnite, garnets, epidotes and other related minerals.
[Rock Currier 2010]


Prehnite
Mali
Kayes Region, Nioro du Sahel Circle, Matia

Prehnite	© Rob Lavinsky

Prehnite, 3.1 cm wide	© Rob Lavinsky

Prehnite & amphabole 7cm tall	©

These specimens were produced from a locality similar to the one described above.


Prehnite
Morocco
Meknès-Tafilalet Region, Er Rachidia Province, High Atlas Mts, Imilchil

Prehnite, ~3cm wide	© Elmar Lackner

Prehnite, 10cm wide	© Rob Lavinsky

Prehnite, 6.3cm wide	© Safaa Yu

Prehnite on Orthoclase 4cm wide	© Martins da Pedra

Prehnite, 5.2cm tall	© Rob Lavinsky

Prehnite & Quartz, 4.5cm wide	© Rob Lavinsky

Prehnite
Morocco
Oriental Region, Figuig Province, Bou Arfa, Djebel Melh

Prehnite, 6.8cm tall	© fabreminerals.com

Prehnite, 9cm wide	© fabreminerals.com

Prenite 12cm wide	© Yves Masson

Prehnite 8cm wide	©

Prehnite & Quartz 6.2cm wide	©

Prehnite 6.5cm wide	© G. van der Veldt

Prehnite
Morocco
Taza-Al Hoceïma-Taounate Region, Taza, Taza Province

Prehnite 5cm wide	© Martins da Pedra

Prehnite ~8cm	© Martins da Pedra

Prehnite, 7.5cm wide	© Thomas Witzke

Prehnite
Namibia
Erongo Region, Brandberg District, Brandberg area

Prehnite & Quartz, 5.8cm	© Rob Lavinsky

Prehnite on Quartz, 2.7cm tall	© Rob Lavinsky

Prehnite & Quartz, 6.1cm tall	© Rob Lavinsky

Prehnite on Quartz, 3.0cm tall	© Rob Lavinsky

Prehnite, 4cm wide	© Rob Lavinsky

.

Prehnite & Quartz, 7.9cm wide	© Rob Lavinsky

Prehnite on Quartz ~5cm tall	© Weinrich

Prehnite on Calcite 5.3cm wide	© Weinrich

I think Charles Key got many of the good prehnite specimens from this locality that have made their way to the USA.
[Rock Currier 2009]



Prehnite
Namibia
Erongo Region, Brandberg Area, Goboboseb Mountains, Tafelkop

Prehnite on Epidote 2.3cm tall	© Eric Graff

Prehnite
Namibia
Erongo Region, Brandberg District, Brandberg area, Goboboseb Mountains

Prehnite on amethyst xl, 6.6cm tall	© Rob Lavinsky

Prehnite on Quartz xl. 3.2cm tall	© Rob Lavinsky

Prehnite, 5cm wide	© 2001 John H. Betts

Prehnite on amethyst xl. 5cm tall	© berghäuser

Prehnite, 4cm long	© 2001 John H. Betts

Prehnite & Quartz, 6 cm tall	© berghäuser

Prehnite & Calcite, 6cm wide	© 2001 John H. Betts

Prehnite & Calcite, 9cm wide	© Edelmin

Prehnite on amethyst 4.7cm tall	© Eric Graff

Prehnite & Calcite 10.5cm tall	© Rob Lavinsky

Prehnite & Quartz ~7cm wide	© Paul De Bondt

Prehnite on Quartz 5.3cm tall	© Weinrich

Prehnite 4.4cm tall	© Rob Lavinsky

I think Charles Key was responsible for many of the fine prehnite specimens that have found their way into the US market. They were never abundant, and the good ones quite rare.


Perhnite
Namibia
Karas Region

Prehnite 6.5cm tall	© Weinrich Minerals, Inc.

Prehnite
Namibia
Karas Region, Keetmanshoop District, Koedoekop (Kudicop; Kudukop)

Prehnite 8cm wide	©

Prehnite
Norway
Aust-Agder, Risør, Søndeled

Prehnite, 4cm wide	© Jorge M. Alves

Prehnite
Norway
Aust-Agder, Risør, Søndeled, Ravneberget quarry

Prehnite, 15cm wide	© Knut Eldjarn

Prehnite
Norway
Buskerud, Kongsberg

Prehnite & Calcite, ~8cm wide	©

Prehnite
Norway
Vestfold, Horten, Borre, Bekkajordet

Prehnite 7cm wide	© K.E.Larsen

Prehnite
Norway
Vestfold, Holmestrand, Bentsrud (Solumbrekka)

Prehnite 4.8cm wide	© K.E.Larsen

Prehnite
Norway
Møre og Romsdal, Halsa, E 39 Vinjefjorden

Prehnite 5cm tall	© Egil Hollund

Prehnite on Epidote 3.3cm wide	© Egil Hollund

Prehnite
Norway
Sør-Trøndelag, Holtålen, Haltdalen, Reitan

Prehnite 8.5cm wide	© Egil Hollund

Prehnite 8.5cm wide	© Egil Hollund

Prehnite
Norway
Sogn og Fjordane, Gular

Prehnite 2cm wide	© OT. Ljøstad

Prehnite
Norway
Sør-Trøndelag, Holtålen

Prehnite 6.5cm wide	© Peter Andresen

Prehnite
Norway
Nord-Trøndelag, Namdalen

Quartz on Prehinte 11.5cm wide	© ØT

Prehnite
Pakistan
Balochistan (Baluchistan), KharanKharan

Prehnite & Quartz, 8.4cm wide	© Rob Lavinsky

Prehnite casts, ~13cm wide	© Rob Lavinsky

Prehnite after ? 6.8cm wide	© Rob Lavinsky

Prehnite after ? 15.2cm wide	© Rob Lavinsky

Prehnite
Pakistan
Gilgit-Baltistan (Northern Areas), Baltistan, Skardu District, Shigar Valley, Alchuri (Alchori; Aschudi), Alchuri Alpine Vein Locality

Prehnite on Diopside 2.9cm tall	© Rob Lavinsky

Prehnite
Pakistan
North-West Frontier Province

Prehnite, 3.1cm wide	© Rob Lavinsky

Prehnite
Pakistan
North-West Frontier Province, Malakand Region, Swat District (Swat Valley), Mullah Yusef

Prehnite, 7.9cm across	© H. Obodda

Prehnite
Portugal
Leiria District, Monte Redondo, Leiria, Montijos Quarry

Prehnite, ~7.5cm	© Martins da Pedra

Prehnite, 4cm wide	© Martins da Pedra

Prehnite
Russia
Eastern-Siberian Region, Taymyrskiy Autonomous Okrug, Taimyr Peninsula, Putoran Plateau

Prehnite, 5.5cm wide	© Oleg Lopatkin

Prehnite
Russia
Eastern-Siberian Region, Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Evenkia (Evenkiyskiy Autonomous okrug), Nizhnyaya Tunguska River Basin (Lower Tunguska River)

Prehnite ~6cm wide	© B.Z. Kantor

Prehnite
South Africa, Republic of
Northern Cape Province, Calvinia, Zoetwater (Soetwater)

Prehnite, 11.8 cm wide	© Rob Lavinsky

Prehnite
South Africa, Republic of
Northern Cape Province, Kalahari manganese fields, N'Chwaning Mines

Prehnite on Xonotlite, 3.5cm tall	© Rob Lavinsky

Prehnite, 3.7cm wide	© Rob Lavinsky

Prehnite, 4.5cm wide	© Rob Lavinsky

Prehnite, 5.4cm wide	© Rob Lavinsky

Prehnite & Xonotlite, 4.7cm wide	© Rob Lavinsky

Prehnite on Calcite, 5.1cm tall	© Rob Lavinsky

Prehnite on Calcite, 5.4cm	© Rob Lavinsky

Prehnite, 6.3cm tall	© Rob Lavinsky

Prehnite & Inesite 10.7cm wide	© Rob Lavinsky

Prehnite 6.5cm wide	© Rob Lavinsky

Prehnite, Inesite & Xonotlite 2.6cm wide	© Rob Lavinsky

Some of these small prehnite specimens are amazing. The most striking thing about them is there orange color. I think that most of the ones that have made their way to the collectors in the USA were brought here by Charles Key who lives part time in Namibia. The locality is a stingy one and there were probably no more that two or three flats of this material found.


Prehnite
South Africa, Republic of
Northern Cape Province, Calvinia, Zoetwater (Soetwater)

Prehnite after calcite ~21cm wide	© TVM

Prehnite
Spain
Andalusia, Jaén, Carchelejo, Oficarsa Quarry (Cerro de las Culebras)

Prehnite, 5cm wide	© Carlos Pareja

Prehnite ball 4cm wide	© Carlos Pareja

Prehnite, 5cm wide	© fabreminerals.com

Prehnite, 6cm tall	© E-Minerales

Prehnite, 6cm wide	© Carlos Pareja

Prehnite, 6.7cm wide	© fabreminerals.com

Prehnite, 5.7cm wide	© Fabre

Prehnite 5.1cm tall	© Rob Lavinsky

Prehnite 7.3cm wide	© Rob Lavinsky

Prehnite 6.2cm wide	© Rob Lavinsky

Prehnite 8.7cm wide	© fabreminerals.com

The prehnites from Spain can be surprisingly good. We need someone to tell us more about the specimens from this locality.


Prehnite
Spain
Andalusia, Seville, Lebrija

Prehnite, 5cm wide	© Martins da Pedra

Prehnite ~5cm wide	© Rui Nunes 2007

Prehnite ~3.5cm wide	© Rui Nunes 2007

Prehnite
Spain
Andalusia, Seville, Lebrija, Minera I Quarry

Prehnite 12cm wide	© Yves Masson

Prehnite
Spain
Madrid, Valdemanco, La Saludadora Quarry (La Cabrera pluton)

Prehnite, Quartz & Orthoclase 7.2cm	© Fabre

Back side of left	© Fabre

Prehnite
Switzerland
Grischun (Grisons; Graubünden)

Prehnite, 7cm tall	© 2001 John H. Betts

Prehnite ~6cm across	©

Prehnite, ~6cm across	©

Prehnite ~5.1cm wide	© Jasun McAvoy

Prehnite
Tanzania
Arusha Region, Lelatema Mts, Merelani Hills (Mererani)

Prehnite, 2.5cm tall	© Rob Lavinsky

Prehnite 3.3cm tall	© Rob Lavinsky

Prehnite ball, 1.8cm wide	© Houran Collection

Prehnite, 3.3cm wide	© Rob Lavinsky

Prehnite on Zoisite 4.2cm tall	© Fabre

Prenite & Chabazite, back side of left	© Fabre

Prehnite & Zoisite 5cm wide	© A&M

Prehnite on Zoisite 5cm wide	© Bill Dameron

Zoisite, Prehnite & Calcite 3.2cm wide	© Weinrich

Prehnite 7cm tall	©

Prehnite 3.3cm wide	© Dan & Diana Weinrich Minerals

Prehnite 2.5cm wide	© Marin Mineral

When these yellow prehnites were first found, they were thought to be Adamite crystals. Some have even been found growing on purple crystals of tanzanite. We need someone to tell us about the specimens from this locality.


Prehnite
United Kingdom
Scotland, Central Region (Stirlingshire), Campsie Fells

Prehnite ~7cm wide	©

Prehnite
United Kingdom
Scotland, North West Highlands (Inverness-shire), Isle of Skye, Soay Sound, Sgurr nan Cearcall

Prehnite, 6cm wide	© M.Wood

Prehnite
United Kingdom
Scotland, Strathclyde (Ayrshire), Beith, Loanhead Quarry

Prehnite ~15cm tall	© J.Ralph 2004

Prehnite ~3cm wide	© 2002, Gordon Derry

Prehnite
United Kingdom
Wales, Pembrokeshire (Dyfed), St David's Head, Quartz vein outcrop

Prehnite ~5cm wide	© Ian Jones

Click here to view Best Minerals - Prehnite USA. Click here to view Best Minerals P, click here to view and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Last picture selection, November 2012 Rock Currier]]> Rock Currier Best Minerals P Wed, 12 Dec 2012 20:42:22 +0000 http://www.mindat.org/forum.php?read,82,140836,278929#msg-278929 http://www.mindat.org/forum.php?read,82,140836,278929#msg-278929 Simone Citon Best Minerals P Wed, 12 Dec 2012 14:58:18 +0000 http://www.mindat.org/forum.php?read,82,140836,278829#msg-278829 http://www.mindat.org/forum.php?read,82,140836,278829#msg-278829 I know that with any compilation it is easy to decide what to include, damn hard to decide what to leave out....]]> Harold Moritz Best Minerals P Tue, 11 Dec 2012 15:10:20 +0000 http://www.mindat.org/forum.php?read,82,140836,278763#msg-278763 http://www.mindat.org/forum.php?read,82,140836,278763#msg-278763 Rock Currier Best Minerals P Mon, 10 Dec 2012 20:31:26 +0000 http://www.mindat.org/forum.php?read,82,140836,278733#msg-278733 http://www.mindat.org/forum.php?read,82,140836,278733#msg-278733
[www.mindat.org]

And some botryoidal masses:

[www.mindat.org]]]> Harold Moritz Best Minerals P Mon, 10 Dec 2012 14:24:17 +0000