Mindat Mineralogy Messageboard - Best Minerals G http://www.mindat.org/msgboard-73.html Thu, 26 Nov 2009 19:10:06 +0000 Phorum 5.2.8-RC1 http://www.mindat.org/forum.php?read,73,145679,159478#msg-159478 Re: Gold http://www.mindat.org/forum.php?read,73,145679,159478#msg-159478 Could you arrange to have those images uploaded to mindat? If so, I think they would fit nicely in Best Minerals.]]> Rock Currier Best Minerals G Mon, 09 Nov 2009 09:58:48 +0000 http://www.mindat.org/forum.php?read,73,145679,159472#msg-159472 Re: Gold http://www.mindat.org/forum.php?read,73,145679,159472#msg-159472
It is possible that the old gold mines at Lykling, Bømlo, Norway ( [www.mindat.org]) should be included in this article. Active mining for gold took place in the period 1882-1910 and some 140kgs of gold where extracted. In the 1980-ties and 90-ties the the mines where worked for specimens.

The best specimen from here is probably a gold in quartz specimen at the Geological museum in Oslo, containing 670g gold (see [www.kjemi.uio.no]), also Bømlo municipality has a nice specimen ( [www.bomlo.net]. )Norwegian museums and private collections undoubtably has some nice specimens from here.

The gold are hydrothermal in origin, and are found in quartz with pyrite and chalkopyrite in a gabbro host rock penetrated by diabase gangues.

Olav]]> Olav Revheim Best Minerals G Mon, 09 Nov 2009 09:32:53 +0000 http://www.mindat.org/forum.php?read,73,145679,159232#msg-159232 Re: Gold http://www.mindat.org/forum.php?read,73,145679,159232#msg-159232 Thanks for the tidbits. They will eventually be incorporated into the article.]]> Rock Currier Best Minerals G Sat, 07 Nov 2009 21:36:09 +0000 http://www.mindat.org/forum.php?read,73,145679,159157#msg-159157 Re: Gold http://www.mindat.org/forum.php?read,73,145679,159157#msg-159157
Truly awesome article! Some scallywags have suggested that the Groundhog wire (rope) gold is actually Kongsberg silver that was gold plated much as the the USA 5 cent pieces were in 1883 as those coins did not have the word cents on them and were passed as $5 coins - more than a week's wages back East when the fraud occurred. Note that yesterday, the owner of a Congo gold pointed out that the picture of his specimen was posted in the wrong country- Brazzaville instead of DRC. Check at Mongbwalu, Haut-Zaire, Democratic Republic of Congo (Zaïre). Specimen shows nice cubic hopper growth. Unfortunately, the area has been identified as a "blood gold" area of atrocities.]]> Van King Best Minerals G Sat, 07 Nov 2009 13:46:38 +0000 http://www.mindat.org/forum.php?read,73,133117,159156#msg-159156 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159156#msg-159156
Great photos! They are more likely to be wurtzite.]]> Van King Best Minerals G Sat, 07 Nov 2009 13:35:39 +0000 http://www.mindat.org/forum.php?read,73,133117,159155#msg-159155 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159155#msg-159155 In Biscay there is a location for greenockite, but there aren´t cristals. It is the Angela mine on Matienzo village,Spain.]]> Álvaro M. Best Minerals G Sat, 07 Nov 2009 13:22:20 +0000 http://www.mindat.org/forum.php?read,73,133117,159151#msg-159151 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159151#msg-159151 Your English is substantially better than that of most non native English speakers who come to this message board. You might also post the same images on the Identity Help forum. You might get more people helping with ideas. I don't know what you little brown crystals are. Grenockite crystal are generally hexagonal and yours don't seem to fit that category. I am thinking perhaps sphalerite. Have you tried a little acid on on a cotton swab to eliminate calcite as a possibility, though I don't think they are calcites. I wonder if they might be sphalerite. I think you may have to have them tested to be sure.]]> Rock Currier Best Minerals G Sat, 07 Nov 2009 11:41:59 +0000 http://www.mindat.org/forum.php?read,73,133117,159149#msg-159149 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159149#msg-159149
Uwe Ludwig]]> Uwe Ludwig Best Minerals G Sat, 07 Nov 2009 10:43:03 +0000 http://www.mindat.org/forum.php?read,73,133117,159146#msg-159146 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159146#msg-159146
The photos are here.


]]> al mar Best Minerals G Sat, 07 Nov 2009 09:49:47 +0000 http://www.mindat.org/forum.php?read,73,133117,159145#msg-159145 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159145#msg-159145 -------------------------------------------------------
> Hello.
> I´m a mineral collector from Biscay, in Spain.
> Two or three weeks ago, I found a mineral (I think
> it can be greenockite but I´m not sure ) in a
> local basalt quarry.Do you can help me with this
> specimens. I don´t know English very well,
> sorry.
> [www.foro-minerales.com]
> mg_0832_825.jpg
> View of two crystals
> [www.foro-minerales.com]
> 2250205_533.jpg
> Crystal about 1-2mm

The Urls of of the Photos weren´t good. Now there are good.]]> al mar Best Minerals G Sat, 07 Nov 2009 09:36:17 +0000 http://www.mindat.org/forum.php?read,73,133117,159144#msg-159144 Re: Greenockite http://www.mindat.org/forum.php?read,73,133117,159144#msg-159144 I´m a mineral collector from Biscay, in Spain.
Two or three weeks ago, I found a mineral (I think it can be greenockite but I´m not sure ) in a local basalt quarry.Do you can help me with this specimens. I don´t know English very well, sorry.

View of two crystals

Crystal about 1-2mm
]]> al mar Best Minerals G Sat, 07 Nov 2009 09:00:55 +0000 http://www.mindat.org/forum.php?read,73,148537,155696#msg-155696 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,155696#msg-155696 Rock Currier Best Minerals G Sun, 11 Oct 2009 23:21:06 +0000 http://www.mindat.org/forum.php?read,73,148537,155684#msg-155684 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,155684#msg-155684
I have completed the first draft of the gadolinite article.
I'd like to thank all contributors not only for all the direct information and papers sent in my direction, but also for trusting me to use this information wisely ::o

A total of 14 locations are included in the article, and 4 of those stands out compared to the rest ( Barringer Hill, Ytterby, Hidra & Evje/Iveland). I have omitted several Colorado, Swedish and Norwegian locations where multiple cm sized crystals has been found. these has been omitted as locations nearby with a similar geology have produced larger, sharper and less altered crystals. These locations have nevertheless produced larger crystals than some of the locations included, as I have split the locations into two clearly separated categoreies: Micro and macro, trying to present the best of both the large and the small. I have further included both gadolinite-Y and gadolinite-Ce as two separate species inside the same article. All comments on my priorities are highly welcome, as is any further information on the locations included or those that should have been included.

:)-D

Olav]]> Olav Revheim Best Minerals G Sun, 11 Oct 2009 20:56:05 +0000 http://www.mindat.org/forum.php?read,73,148537,151292#msg-151292 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,151292#msg-151292
Ecole du Mines lists an Barringer Hill gadolinite in their collection, catalogue # 2072, size 17x12x9cm, condition excellent. Anyone that has, or can get a picture of this specimen??

Olav]]> Olav Revheim Best Minerals G Tue, 08 Sep 2009 08:35:47 +0000 http://www.mindat.org/forum.php?read,73,148537,150725#msg-150725 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150725#msg-150725 Uwe Kolitsch Best Minerals G Wed, 02 Sep 2009 21:05:06 +0000 http://www.mindat.org/forum.php?read,73,148537,150444#msg-150444 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150444#msg-150444 Gadolinite-(Y) specimens from various localities in the Alps have been examined by electron microprobe and single crystal X-ray diffraction. In general, dysprosium is the most abundant rare earth, although a few samples contain approximately equal amounts of Dy and Yb, and in one instance, Gd predominates. In contrast to many non-Alpine occurrences, most of these specimens show only limited amounts of the lighter REE. There is an almost constant presence of calcium (up to 4 wt% CaO, and possibly twice that amount for more questionable samples); iron is often markedly deficient with respect to the theoretical formula, and in at least one case (Glogstafelberg), the material should more properly be called hingganite-(Y) (4.0 wt% FeO). In some specimens, a significant substitution of B for Be (up to about 4.2 wt% B2O3) can be deduced from crystal-structure data, on the basis of linear interpolation of the measured Be-O bond lengths with respect to other gadolinite-group minerals. This substitution is more extensive for specimens high in Ca and low in Fe, and which therefore grade toward darolite. No evidence for replacement of Si by B has been found. Minor amounts of thorium (up to 0.4 wt% ThO2) commonly are present, and uranium (0.3 wt% UO2) was found in one specimen. As for xeootime and monazite, the behavior of Y is not uniquely determined by the ionic radius, some specimens being especially enriched in this element with respect to the middle-heavy rare earths (up to 41.5 wt% Y2O3).

cheers]]> Johan Kjellman Best Minerals G Mon, 31 Aug 2009 06:55:58 +0000 http://www.mindat.org/forum.php?read,73,148537,150417#msg-150417 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150417#msg-150417 Pavel Kartashov Best Minerals G Sun, 30 Aug 2009 23:13:58 +0000 http://www.mindat.org/forum.php?read,73,148537,150399#msg-150399 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150399#msg-150399 Uwe Kolitsch Best Minerals G Sun, 30 Aug 2009 18:28:11 +0000 http://www.mindat.org/forum.php?read,73,148537,150160#msg-150160 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150160#msg-150160 I found the old pictures from Baringer Hill online: [images.google.se]

hope the link works. They were probably published in one of Frank Hess' papers. If anyone has them on fpdf or if they are online somewhere - please inform

cheers]]> Johan Kjellman Best Minerals G Fri, 28 Aug 2009 11:01:15 +0000 http://www.mindat.org/forum.php?read,73,145679,150143#msg-150143 Re: Gold http://www.mindat.org/forum.php?read,73,145679,150143#msg-150143 The calcite substitution for the gold is very strange. I am sure that it was not originally like this. At any rate it is fixed. Thanks. David. Yes wire is better. Fixed.]]> Rock Currier Best Minerals G Fri, 28 Aug 2009 09:04:11 +0000 http://www.mindat.org/forum.php?read,73,148537,150059#msg-150059 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150059#msg-150059 South Platte District Crystals to 2 inches in length
Clora May pegmatite - crude xl gadolinite y 7x3x2.5 inches (7.5 pounds)
Roscoe pegmatite - well developed monoclinic xls - largest partial xl 11cm in diameter
From "Minerals of Colorado".]]> David Von Bargen Best Minerals G Thu, 27 Aug 2009 14:11:20 +0000 http://www.mindat.org/forum.php?read,73,148537,150058#msg-150058 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150058#msg-150058 Concerning White Cloud pegmatite is anyone aware of crystals from there?

johan]]> Johan Kjellman Best Minerals G Thu, 27 Aug 2009 13:57:16 +0000 http://www.mindat.org/forum.php?read,73,148537,150051#msg-150051 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150051#msg-150051
[attachment 16753 Gadolinit-Y.jpg]

Years ago I had some discussions with Pavel Kartashov about the light green transparent Gadolinites-Y from Furkabasistunnel, Switzerland.
He suggested this being Hingganite. Now one of the ex Alex Kipfer Gadolinites (Alex Kipfer was a wellknown Swiss collector and author)
is shown here as a Gadolinite-Y. The similar habit and colour comes from Abichlalm, Austria. Also titled as Gadolinite-Y.
All alpine minerals in this colour and habit so far are described as Gadolinite-Y. Has this to be revised?

Stephan]]> Stephan Wolfsried Best Minerals G Thu, 27 Aug 2009 12:23:50 +0000 http://www.mindat.org/forum.php?read,73,148537,150049#msg-150049 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,150049#msg-150049 David Von Bargen Best Minerals G Thu, 27 Aug 2009 11:10:26 +0000 http://www.mindat.org/forum.php?read,73,145679,150048#msg-150048 Re: Gold http://www.mindat.org/forum.php?read,73,145679,150048#msg-150048 David Von Bargen Best Minerals G Thu, 27 Aug 2009 11:05:18 +0000 http://www.mindat.org/forum.php?read,73,145679,150045#msg-150045 Re: Gold http://www.mindat.org/forum.php?read,73,145679,150045#msg-150045
Great article on a great mineral, but it seems that two pictures of Elmwood Calcites sneaked in this Gold article.
You will find one Calcite under the locality: Botés, Alba Co., Romania, and the other one under Rosia Montana, Alba Co., Romania.


Regards,
Mario Pauwels]]> Mario Pauwels Best Minerals G Thu, 27 Aug 2009 08:45:01 +0000 http://www.mindat.org/forum.php?read,73,148537,149979#msg-149979 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,149979#msg-149979
Thanks for your fantastic input for this article. I will not have the time to update it the next week or so I think, but the upcoming work are:

- update the Moos location with the article reference and where the big one is located
- include the Vizze pass and the White cloud pegmatite as new location.
- include [www.mindat.org], with this: [www.mindat.org]
- Expand the description of the Ytterby and Hidra locations based additional information.
- include photo(s) from the Hidra pegmatites

If possible, include more information on the scientific work based on gadolinite from Ytterby and Hidra.

A special thanks to Jim for introducing an American locality The US has 2 pages of listed localities. Some of them must have produced quality specimens.

Again, Thank you so much for your amazing and great input. I am learning so much from this work. Thanks again.


:)-D]]> Olav Revheim Best Minerals G Wed, 26 Aug 2009 15:06:51 +0000 http://www.mindat.org/forum.php?read,73,148537,149948#msg-149948 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,149948#msg-149948 for me it is ok when you describe the Municipial quarry and Moos together. The large Gadolinite was found by Roland Winkler and has been published in the Lapis Magazine years ago (Lapis Magazine November 2003). I don`t hae the elder Magazines but I try to get it.]]> Martin Slama Best Minerals G Wed, 26 Aug 2009 06:25:39 +0000 http://www.mindat.org/forum.php?read,73,148537,149942#msg-149942 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,149942#msg-149942 Anonymous User Best Minerals G Wed, 26 Aug 2009 03:06:45 +0000 http://www.mindat.org/forum.php?read,73,148537,149939#msg-149939 Re: Gadolinite http://www.mindat.org/forum.php?read,73,148537,149939#msg-149939 In the discussion I add another place that is the Vizze Pass and it is near to the preceding one where I have found the gadolinite in small but well formed crystals of quality it gemmates.
Unfortunately also in this place as in that preceding they are very rare, but at times looking for with some fortune they are found.
The rock is always metamorphic and more precisely an quartzporphyr in a conglomerate gneiss absorbed.
Very interesting the fact that is the same fissure mineralized where the genthelvite and others rare mineral is found.
Ciao.
[www.mindat.org]
[www.mindat.org]]]> Manuele Moro Best Minerals G Wed, 26 Aug 2009 01:45:38 +0000