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For the Love of Dendrites

Posted by Stephanie Martin  
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Stephanie Martin August 19, 2012 08:17AM
Hi All,

This thread is being dedicated to the lovely form of dendrites. Initially this began as an appreciation of manganese oxides, however I invite any kind of dendrites to be shared here. In addition since dendrites are well suited for lapidary purposes and are poplular as such, these are also welcomed to be shared here.

Here are a few to start the parade. I left out Solnhofen deliberately since I am sure many of you would have wonderful ones to contribute and I would love to see them.

This first one is from Utah, USA, if anyone knows a more specific location please let me know.
Approx 10 x 9 cm




Rockydale Quarry
Roanoke, Virginia, USA
label indicates collected 7/11/1996
6 x 4 cm



Matachewan,
Ontario, Canada
6 x 2cm

open | download - P1370577(1)(1) b.jpg (89.5 KB)
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open | download - P1360044(1)(1) b.jpg (79.1 KB)
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Stephanie Martin August 19, 2012 08:23AM
A few more...

Dřínová, Tišnov, Moravia, Czech Republic
Czech Republic
7.8 x 5.5 cm



Some lapidary items...

Cuprite Dendrites in Pectolite (larimar)
Dominican Republic
2 x 2 cm



Dendrites in Chrysocolla with Malachite
location unknown
18 mm x 14 mm

open | download - P1370586s.jpg (107.6 KB)
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Roberto Bosi August 19, 2012 11:14AM
Nice idea, Stephanie. Here are two specimens from Solnhofen. The first, as regards of the dendrites, is not exceptional but agreeable; a single, isolated, well defined and almost symmetric "branch". This is an occasion, however, to show a very nice Saccocoma pectinata (on the left), a probable larval crinoid typical of this place. Its diameter is 26 mm.

The second specimen is an ammonite (diameter 30 mm) crossed by well defined dendrites. I hope you like it.

Better to be just than good (Kempis)
open | download - IMG_7438.jpg (98.1 KB)
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Rock Currier August 19, 2012 11:35AM
Stephanie,
Why don't you write an article about dendrites? At the very least you should write up a better definition for our glossary than the one we have and show some more pictures of them.

Rock Currier
Crystals not pistols.
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Agustin Agudo Espinosa August 19, 2012 12:46PM
I bring a bit more to the fantastic world of the dendrites
I think for many, was the first samples, we began to captivate.
Here is a copy of manganese oxides from Jalapa Mine in El Molar, Tarragona, Catalonia, Spain.
Greetings to all.
Agustin Agudo Espinosa.
open | download - varios 206.jpg (308 KB)
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Rui Nunes August 19, 2012 01:43PM
... and some manganese dendrites from Portugal. Greetings, RN

open | download - dendrites portugal 12 cm.jpg (105.9 KB)
open | download - dendrites portugal 10 cm.jpg (99.8 KB)
open | download - dendrites portugal 7 cm.jpg (92.6 KB)
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Kelly Nash August 19, 2012 03:19PM
Beautiful examples and great topic! I hesitate to put this here because I am of course quite dubious that it's authentic. It appeared in Mineral Digest (vol. 5, Winter 1973) in an article by Roger Caillois, and well, it's interesting. The caption said it is limestone and the source is unknown and there was nothing else about it in the text. I'm curious if anyone has seen this piece and knows anything more about it.

http://www.mindat.org/forum.php?file,17,file=40084,filename=Dendrites-sml.jpg



Edited 2 time(s). Last edit at 08/19/2012 03:24PM by Kelly Nash.
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Norman King August 19, 2012 03:59PM
This appears to be a dendrite of hematite. Perhaps it is hematite after a Mn oxide, but the rim of normal-appearing Mn dendrites around the hematite suggests the hematite was original. This was found at a fossil quarry in shale of the Middle Cambrian Wheeler Formation, House Range, Millard Co., Utah. There are trilobites on bedding surfaces in this piece.





Edited 1 time(s). Last edit at 08/19/2012 04:01PM by Norman King.
open | download - hematite-Mn dendrites,close-up-1.jpg (166.2 KB)
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Dennis Tryon August 19, 2012 04:48PM
Steins Pass, New Mexico, north side of I-10, self-collected.

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Stephanie Martin August 19, 2012 05:36PM
Great stuff everyone! Glad to see there is interest. Kelly, that piece would definitley require more investigation.

Rock, I will eventually put together an article, would like to see what interesting things may turn up on this thread in the meantime.

regards,
stephanie :-)
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Agustin Agudo Espinosa August 19, 2012 06:12PM
Now an example of the Canary Islands, dendrites of manganese oxides, found on the road near the village of Toto on the island of Fuerteventura (basal complex).

A.Agudo Espinosa.
open | download - varios 210.jpg (293.7 KB)
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Rui Nunes August 19, 2012 06:35PM
Kelly,
I bet 99,99 % that this is not a dendrite neither a limestone specimen. It seems man made something like a drawing inspired in a limestone landscape and in the dendrites effects. Buildings, people, trees, birds, all in the right place... not natural for me.
Cheers



Edited 1 time(s). Last edit at 08/19/2012 09:20PM by Rui P Nunes.
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John Montgomery August 19, 2012 08:29PM
Glad to hear that Stephanie...I look forward to reading that article as I have no idea what these beautiful specimens are or how they came about etc....thanks
John
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António Manuel Ináçio Martins August 19, 2012 08:41PM
Hi Sthephanie :-)

Some Dendrites of my collection : http://www.mindat.org/user-3851.html#2_0_26645_0_0_0_

Regards.

Martins da Pedra
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Dean Allum August 19, 2012 09:14PM
Rui, Those are magnificent. Could you please post more pictures from your collection?

Stephanie, do these fit the definition of mimetoliths?

While I don't have any worthy manganese dendrites, this fluorite pattern is reminiscent of dendrites.
-Dean Allum
http://www.mindat.org/photos/0488935001293913634.jpg



Edited 1 time(s). Last edit at 08/19/2012 09:17PM by Dean Allum.
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Stephanie Martin August 19, 2012 09:41PM
Thanks all for the continued contributions, hope everyone is enjoying them as much as I am.

Dean, I would assume that they would qualify because they do resemble trees or ferns or such. And I do believe you have a worthy example of dendrites, and the spodumene they have formed on makes a nice contrastive canvas.

http://www.mindat.org/photo-357307.html

cheers,
stephanie :-)
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Rui Nunes August 19, 2012 09:55PM
Hi Dean Allum. thanks for your comments... more three pics. Cheers

open | download - dendritesportugal14cm.jpg (103.9 KB)
open | download - dendritesitaly5cm.jpg (209.7 KB)
open | download - dendritesportugal10cm.jpg (111.5 KB)
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Dan R. Lynch August 20, 2012 12:38AM
Don't forget about dendrites within/on agates. Here's one of my favorites: my dad had a junk Lake Superior agate, showing no banding or any other redeeming features. Tossing it into a bucket, it broke along its banding (which we call "peeling," as this typically occurs due to freeze/thaw cycles). Examining the two halves that had popped apart, I noticed this tiny 1cm dendrite hiding on the surface, where it had been formed in the microscopic space between the bands.
open | download - Dendrite005.jpg (65.2 KB)
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Marc Miterman (2) August 20, 2012 03:28AM
Wow, What a great thread !
I have always loved Dendrites.
This specimen has been in my collection since 1971.

Pyrolusite Dendrite
Eichstatt, West Germany

16 cm x 9 cm



Edited 2 time(s). Last edit at 08/20/2012 04:04PM by Marc Miterman (2).
open | download - dendrite 003.JPG (627.4 KB)
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Tom Goodland August 20, 2012 11:55AM
Hi everyone,

I recently found some calcite crystals with distinct presumably manganese oxide dendritic growths on several of the crystal faces. I have found similar dendritic growths from several different locations, where they had been caused by solutions seeping between bedding planes, but i'm mystified how these particular dendrites could have formed. Has anyone else seen dendrites on crystal faces?

Sorry no photos at present, all my specimens are in storage.

thanks

tom goodland
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Boris Erjavc August 20, 2012 03:43PM
Hi,
here are some of calcites with probably manganeze dendrites on crystal faces.
Mežica Mine,Slovenia:


Back side, same specimen:


Jasovnik tunnel, Slovenia. 3 × 3.5 × 3 cm

Specimen was all embeded in clay.

Good luck

Boris
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Rob Woodside August 20, 2012 05:29PM
Dendrites loved and lost.

Hope's Nose Gold
Alberoda Silver



Santa Rita Copper
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Rock Currier August 20, 2012 06:52PM
The Mineral Digest was created by Julio Tangelof sp? who ran a company called Astros back in the 70s in New York City. He was notorious for never paying his bills and selling Mexican coconut geodes that cost $5 anywhere else but he was selling them for $60. His sales people often didn't know what they were selling and I doubt that he could identify more than 20 common minerals by sight.. The people he hired to run his organization knew even less. He was an egomaniac of the first order. The magazine was designed as an advertising vehicle and for his personal aggrandizement which shines through loud and clear if you read some of the articles that he paid a captive editor to have written about him and his wife by hacks. I should add that this is my personal point of view and that his descendants still run the business out of NY City today and might have an entirely different point of view.

Rock Currier
Crystals not pistols.
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Stephanie Martin August 20, 2012 07:15PM
Thanks for the info Rock. Given that information we could discern that there is likely not much credibility/validity behind the publication regarding the piece that Kelly posted. I agree with Rui, it has too many things in the correct order.

Rob, you say you "lost" those, I hope they went to good homes. Thanks for sharing your mementos.
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Rob Woodside August 20, 2012 07:38PM
The Copper is on display at the Royal Ontario Museum and maybe the Gold is too. The Silver is in the dungeon there.
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Raúl Jorge Tauber Larry August 21, 2012 01:44AM
Microphoto of Manganese Dendrites on Aragonite.
FOV: 4 x 4 mm.
From "Puesto Viejo" Quarry, Sierra de Puesto Viejo, Santa Bárbara Department, Province of Jujuy, Argentina.
Collected in 2004.
open | download - Manganese_Dendrites_on_Aragonite.jpg (384.3 KB)
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Raúl Jorge Tauber Larry August 21, 2012 01:54AM
Manganes dendrites on mud-clay.
Specimen size: 12,7 x 9 x 1.8 cm.
From Raco River, Trancas Department, Province of Tucumán, Argentina.
Collected in 2010.
open | download - Manganese_dendrites_1.jpg (183.4 KB)
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Raúl Jorge Tauber Larry August 21, 2012 01:57AM
Manganese Dendrites on Clay-Shale.
Specimen size: 6.7 x 4 x 2.1 cm.
From Salar del Hombre Muerto, Antofagasta de la Sierra Department, Province of Catamarca, Argentina.
Collected in 2002.
open | download - Manganese_dendrites_2.jpg (67 KB)
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Raúl Jorge Tauber Larry August 21, 2012 02:00AM
Manganese Dendrites on mud-clay.
Specimen size: 7 x 4 x 2,3 cm.
From "Loro" River, Burruyacú Department, Province of Tucumán, Argentina.
Collected in 80´s.
open | download - Manganese_dendrites_3.jpg (91.1 KB)
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Raúl Jorge Tauber Larry August 21, 2012 02:04AM
Dendritic manganese oxides on schist.
Specimen size: 19.5 x 11 x 0.5 cm.
From Salar del Hombre Muerto, Antofagasta de la Sierra Department, Province of Catamarca, Argentina.
Collected in 2004.
open | download - Manganese_dendrites_4.jpg (208 KB)
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Stephanie Martin August 21, 2012 03:59AM
Raul ~ Wonderful pieces. Nice to see from Argentina!

Tom - regarding growth on crystals, I think it depends on the type of crystal and the environment in which the dendrites form. Dendrites are seen frequently on feldspars and I think it might have to do with the actual surface of the crystal. Certainly they seem to like more porous surfaces, perhaps that is a coincidence based on the nature of the deposits where they are more typically found. But you are are right, you don't see them much on gem type crystals, more in them than on them, especially quartz. I suspect this might have to do with secondary deposition conditions and these don't seem to favour them forming and adhering to gem crystals in their environs.

Here is a feldspar with some incipient dendrites in what I call the blotchy stage.

Orthoclase twin
Cinco, Kern Co, California USA
4 x 2.5cm ex Fred Devito

open | download - P1360105(1)(1).jpg (483.8 KB)
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Stephanie Martin August 21, 2012 04:16AM
Dan, yes agates, jaspers, opals et all are definitely welcome. I really don't know where to start! I am hoping that others will share such natural art.

There has been a lot of this Chinese jasper out there, they look so much like paintings, so I had to get one of course. 10 x 4cm.



And the great thing is that it has two sides that can both be displayed, which side to choose? Or should I get one of those spinning frames? LOL.



cheers,
stephanie :))
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Stephanie Martin August 21, 2012 05:28AM
Sorry I don't have many details on this one such as age and species (I suppose I could look it up but nah, too lazy), I bought it for the dendrites. Imagine that. Oh, I should have warned you... I love dendrites. :-D

Fossil Clam
Indonesia
4.3 x 2.8cm

open | download - P1370490(1)(1).jpg (463.7 KB)
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Corie Mattar August 21, 2012 07:44AM
All these specimens are fantastic, I really find myself liking the white with black dendrites from Portugal, very striking!

Here is a lemon opal dendrite from the Knoxville Recreation Area north of Napa California.
open | download - S6302408a.jpg (200.8 KB)
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Stephanie Martin August 25, 2012 05:51PM
Dendritic Copper
Colonial Mine
Cape D'Or, Cumberland Co, Nova Scotia, Canada
~3cm



Aborescent Silver coated with Safflorite
Millerette Mine, Haultain Township, Gowganda area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada
~2cm

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Raúl Jorge Tauber Larry August 26, 2012 02:32AM
Dendrites of Mossy Agate
FOV: 10 x 5 mm.
From Madagascar.
open | download - gata_musgosa_1.jpg (321.7 KB)
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Raúl Jorge Tauber Larry August 26, 2012 02:56AM
Beautiful dendritic massive specimen of Native Copper with Quartz Cystals included.
Specimen size: 9.5 x 9 x 4.6 cm.
From Copiapó, Copiapó Province, Atacama Region, Chile.
Collected in 1996.
open | download - Copper_Ch_3.JPG (409.5 KB)
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Raúl Jorge Tauber Larry August 26, 2012 02:58AM
Beautiful dendritic massive specimen of Native Copper with Quartz Cystals included.
Specimen size: 10.5 x 6.5 x 6 cm.
From Copiapó, Copiapó Province, Atacama Region, Chile.
Collected in 1996.
open | download - Copper_Ch_1.JPG (487.6 KB)
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Raúl Jorge Tauber Larry August 26, 2012 03:01AM
Very nice sample of Dendritic Native Copper with flattened crystals and Malachite covered.
Specimen size: 5.6 x 2 x 1.1 cm.
From Osceola Shaft # 10, Calumet, Houghton County, Michigan, U.S.A.




Edited 1 time(s). Last edit at 08/26/2012 03:03AM by Raúl Jorge Tauber Larry.
open | download - Copper_Mi_2.JPG (185.4 KB)
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Raúl Jorge Tauber Larry August 26, 2012 03:11AM
Beatiful Dendritic Psilomelane. It looks as branches of tree.
Specimen size: 7.5 x 6 x 4.5 cm.
From La Providencia Mine, Susques Department, Province of Jujuy, Argentina.
Collected in 60´s.
open | download - Psilomelane_1.JPG (590.5 KB)
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Stephanie Martin August 26, 2012 06:55AM
Very nice Raul, thanks for sharing. I really like the psilomelane.

Here are some cryptomelanes. I have posted these before but couldn't resist posting again for the dendrite cause.

Cryptomelane
Pitorra mine, Galiléia, Minas Gerais, Brazil
Longest dendrite 28mm
faceted stone is 15mm x 10mm (unknown dendrite type), Brazil

open | download - P1120667(1)(1)(1)(1).jpg (258.1 KB)
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Stephanie Martin August 26, 2012 07:02AM
It's about time for some dendritic opals...

Moss Opal
Nasławice, Gogołów-Jordanów Massif, Lower Silesia (Dolnośląskie), Poland
~4.5 x 4.5cm



The next two are from the same location, Czech Republic.

Bohouskovice, České Budějovice (Budweis), South Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic
3.0 x 1.5 cm



2.0 x 1.5 cm

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julie g. powell August 26, 2012 02:05PM
Stephanie Your sample looks like many I have seen at the Iron mines around
cedar City Iron county ,Utah Check out Dave Crosby site for maps and locations. I have been looking for dendrites in agate ( good one) in the east hills around Summitt Utah A very large area for agate, it goes all the way up the mountain to Brian Head Happy Hunting/size>
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julie g. powell August 26, 2012 02:08PM
Stephanie Your sample looks like many I have seen at the Iron mines around
cedar City Iron county ,Utah Check out Dave Crosby site for maps and locations. I have been looking for dendrites in agate ( good one) in the east hills around Summitt Utah A very large area for agate, it goes all the way up the mountain to Brian Head Happy Hunting/size>
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Bart Cannon August 26, 2012 03:48PM
I want to grow my own manganese oxide dendrites.

They seem to be natural fractals, and I have a hunch that they grow quickly and, as Bacteria Bart, I think there is an organic aspect to their formations, but I have never heard of mangenese metabolizing bacteria.

I tried an experiment. I crushed up some dirty manganese oxides, emusled them in rainwater, moistened some microscope slides in the suspension and waited almost a year for something to happen. Nothing happened.

It seems as though they most commonly form in fractures in carbonate rocks. I wonder it those carbonate rocks are most often manganese bearing.

My next effort will be to create some little slabs of manganese bearing carbonate rock, join them, and put them in dirty rainwater and leave them alone for at least a year.

Are there non manganese oxide examples of dendrites ?

Bart
.
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Stephanie Martin August 26, 2012 04:09PM
Bart - an important factor in the growth of dendrites is surface tension, that's why I don't think they grew on your slide, or why they don't grow on many well developed gemmy crystals. The surfaces do not have enough "gription". There are a number of factors hat have to be just right for them to grow and it is my observation that porous rocks such as carbonates are a better host. These are usually sedimentary in nature, or weathered granitic formations where the environmental conditions exist suited for the growth of dendrites. There may be an organic component which is being studied. Yes, there are other dendrites besides manganese oxides, iron oxides would probably be the next most common.

And yes, they are natural fractals.



Edited 2 time(s). Last edit at 08/26/2012 04:25PM by Stephanie Martin.
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Bart Cannon August 26, 2012 05:20PM
Thank you Stephanie,

I can't tell if your cryptomelanes are beautiful or creepy. I'll stick with fascinating.

I have an intuition that dendrites form by capillary activity (wicking).

My next experiment in growing my own dendrites will be to split some fine grained carbonate rocks and bind the pieces back together rather than ginding and mating some small slabs. That should improve the "gription" and improve my chances of becoming the first dendrite artist. A goal with no practical value. My specialty.

Maybe I'll use some weak manganese sulfate solution with the rainwater.

Bart
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Alex Homenuke August 26, 2012 11:09PM
Re: "a goal with no practical value" - I don't know about that, Bart. The psychologists could use them for Rorzhak (sp) tests.
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Bart Cannon August 27, 2012 03:24AM
Alex,

That's very funny, i retract my statement about no practical value for dendrites..

A completely natural and random source for Rorschack images.

I will would work on Rorschack pairs during first day of retirement. Except that would be a day after I'm dead.

I don't know how to spell that guy's name either.

I seem to think that Ruggles Mine uraninite, gummite specimens show a dendritic nature.

The difference between dendritic and arborescent features would seem to be two dimensions vs. three dimensions.

Bart
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Stephanie Martin August 27, 2012 04:07AM
Bart you are right about the uraninites from Ruggles, also some triphylite from the same area shows this as well. I'll post some eventually :))

Wicking may be a factor in the creation of surface dendrites as per your instinctual hunch.

And FYI the correct spelling is Rorschach. I would think that inkblots are essentially fractals as well.
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Maggie Wilson August 27, 2012 11:40AM
Bart Cannon Wrote:
-------------------------------------------------------
>
>
> The difference between dendritic and arborescent
> features would seem to be two dimensions vs. three
> dimensions.
>
> Bart


a-HA! - Answers a question that I've been pondering since the start of this thread - thanks, Bart!

Maggie
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Maggie Wilson August 28, 2012 02:33PM
The Handbook of Mineralogy describes the crystal habit of berzelianite as "thin dendritic crusts"

Dendrites, eh? Ok, here we go! The display face of this specimen has been cut and polished to show off the dentritic effect.

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Stephanie Martin August 29, 2012 03:35AM
Maggie that berzelianite is really cool polished like that. Striking piece!

Well it seems I keep finding those dendrite things turning up everywhere. :-D

Here's another featuring arborescent copper in gypsum.

Mission complex, San Xavier, Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA
FOV 1.5 cm

open | download - P1370789(1)(1)(1).jpg (402.8 KB)
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Rick Dalrymple August 29, 2012 07:07AM
I have always loved dendtrites. I started gathering them up but quickly over ran my daughter with things to photograph.
Here are a few...













Rick
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Maggie Wilson August 29, 2012 01:16PM
These arborescent silver crystals are covered in micro safflorite crystals - leaves of silver for accent.

I love the structural aspect of these specimens and they LOVE to be photographed.

Castle Mine
Cobalt-Gowganda region, Ontario, Canada
2.6 x 2.0 x 0.8 cm

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Rick Dalrymple August 29, 2012 03:47PM
Siltstone
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Alexis Monnerot August 29, 2012 03:56PM
Manganese oxyde dendrites self-collected, from Argentinia.
open | download - dendrite2.jpg (71.6 KB)
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Rick Dalrymple August 30, 2012 06:36AM
More dendrites...







Rick
I know I am in my own little world, but everyone knows me here.
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Rick Dalrymple August 30, 2012 07:42PM
More...



Rick
I know I am in my own little world, but everyone knows me here.
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Rick Dalrymple August 30, 2012 08:34PM
These malachite dendrites are very prolific at the mine. They are on sandstone and are about a thick as a hair, maybe thinner.



Rick
I know I am in my own little world, but everyone knows me here.
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Maggie Wilson August 31, 2012 11:59AM
Here's a local one for you Steph - a thumbnail of manganese oxides from the DeForest Quarry, near Inglewood, Ontario.

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Clifford Trebilcock August 31, 2012 02:10PM
Hi Steph,



Here is a photo of some Dendrites in translucent Quartz I collected from an unnamed Feldspar prospect in Center Minot,Maine.
It is about 9 X 6 CM in size and the Dendrites are both on the surface and along internal fractures. Many great photos of Dendrites on this thread.

Cliff



Edited 1 time(s). Last edit at 08/31/2012 03:03PM by Clifford Trebilcock.
open | download - DSC00079 (23).JPG (201.8 KB)
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Stephanie Martin September 01, 2012 06:21AM
Nice to see all the great contributions! Alexis that is a lovely find, definitely a keeper.

Rick - thanks for sharing so many, you made my day.

Maggie – a nice local surpise, and from a location that is usually known for orange celestite. Just wonderful!

Cliff, that is a stunning unspoiled dendritic quartz! Hope you plan to keep it that way!

More on opals. You often see this material used for cabachons, pendants, earrings etc, but I just find the centers are fascinating on these dendritic opal nodules from Turkey. The chalcedony layer adds some interesting contrast and is fluorescent.

Eskişehir Province, Central Anatolia Region, Turkey
7 x 5 cm and 5.5 cm

open | download - P1000759(1)(1) b.jpg (92.2 KB)
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John Stolz September 01, 2012 08:03PM


Hey Steph, whaddya think of this one?

Regards, John
open | download - Stephs POTD.jpg (32.1 KB)
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Dean Allum September 01, 2012 11:30PM
Wow John,
That's a beautiful specimen! It's good to see that you have finally developed an appreciation for mineralogy and some healthy curiosity.

Unless you have just illegally posted a copyrighted picture which you do not own. THEN SHAME ON YOU!! :-X



Edited 1 time(s). Last edit at 09/01/2012 11:52PM by Dean Allum.
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Stephanie Martin September 02, 2012 06:56AM
John, a stunning lilac spodumene adorned with dendrites! I can't take my eyes away from it! I've spent more than 5 minutes trying to think of something positive to say to you for cheating by posting my photo. There's an old cliché about imitation being the highest form of flattery. Nice try, but you need to get your own dendrites! :-X

stephanie
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John Stolz September 02, 2012 11:02AM
Dean,

I think you're confusing "appreciation" with "aesthetics". I actually have both. What I seem to be missing is good judgement.

Steph,

Apologies; it didn't occur to me that I would cheat you by posting your picture. 4 pages of posts went by and I never saw it. I was under the impression that this was all about knowledge for knowledge's sake.

To both of you,

1. There was no intention on my part of claiming "credit" for a photo that doesn't belong to me. Hover your mouse over the picture and see what you see,
2. There's always a danger with the written form of communication for miscommunication to occur. For my part, I apologize for having taken the liberty of assuming you would find my clownish actions amusing and in good spirit, instead of insulting. You can be assured I won't take such liberties in the future. Especially now that it seems clear that all I'm doing is making an idiot of myself by having to post a public apology.
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Raúl Jorge Tauber Larry September 02, 2012 03:20PM
Manganese Dendrites on Feldspar(Albite-Anorthite Series).
FOV: 5 x 4 mm.
From Pegmatite of Milagro Mine, Cerro Pichao, Sierra de Quilmes, Tafí del Valle Department, Province of Tucumán, Argentina.
Collected in 1973.


FOV: 5 x 5 mm.
open | download - Manganese_Dendrites_1_Milagro_Mine.jpg (340.2 KB)
open | download - Manganese_Dendrites_2_Milagro_Mine.jpg (124.1 KB)
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Raúl Jorge Tauber Larry September 02, 2012 05:01PM
Manganese oxides dendrites on feldspar(Albite-Anorthite Series).
From pegmatite of "Milagro" Mine, Cerro Pichao, Sierra de Quilmes, Tafí del Valle Department, Province of Tucumán, Argentina.
FOV: 4 x 5 mm.




Edited 1 time(s). Last edit at 09/02/2012 05:12PM by Raúl Jorge Tauber Larry.
open | download - Manganese_Dendrites_3_Milagro_Mine.jpg (291.9 KB)
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Stephanie Martin September 02, 2012 05:56PM
John, I was actually rather amused that you posted my photo. But I couldn't resist the return barb. And actually I imitated you as well, by using words from your original post. So I guess you didn't pick up on that, but as you said the written word can sometimes be difficult to impart nuances.

Regarding the specimen, I was going to get around to it posting it again eventually, but it was nice to see it. I have enough dendrite material to post one everyday for the remainder of the year if I wanted to, but will spare you all from that overkill. LOL.

Let's get back to dendrites!
cheers,
stephanie :-)
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Stephanie Martin September 02, 2012 07:35PM
Maggie, here is another from Ontario, but alas there was no other locality information with it.

Dendrites on Feldspar, Ontario, Canada
approximately 6 x 6 cm

open | download - P1380015(1)(1) bb c.jpg (78.8 KB)
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Roger Curry September 02, 2012 10:57PM
Hi all,
just got back from West Cork, Ireland. Went looking for arsenopyrite crystals. Also saw this bit of sandstone, which I left in-situ at the dumps of
Dhurode (Carrigacat) Mine.
Regards,
Rog

open | download - eiredend.jpg (406.4 KB)
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Stephanie Martin September 07, 2012 05:24AM
Roger, thanks for posting that in situ photo. I appreciate that you took the time to notice it there and snap the pic. I was hoping to see dendrites from uncommon places, and you measured up to that expectation nicely. Hope you were able to find some arsenopyrite too.

Today a little piece of jasper-like material known as opalite from Australia. The information I have says it is found in the opalite mines not far from the Yerilla Chrysoprase Mines in the Goldfield Esperance region, Western Australia.

polished
3 x 2 cm

open | download - P1380025(1)(1).jpg (410.5 KB)
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Roger Curry September 07, 2012 11:13PM
I was successful in my primary objective Stephanie, but as soon as I saw the dendrites, it brought back memories of one of my first collecting trips, when I found some lovely manganese dendrites on a slab of magnesian limestone at Sunderland. Some 40 odd years later, I also remembered this thread, so the photo. Here's dendrite formation (NASA)
Regards,
Rog
http://upload.wikimedia.org/wikipedia/commons/4/4d/Dendrite_formation.gif
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Rob Woodside September 08, 2012 05:18PM
Thanks Roger, Is that growing in micro gravity? The horizontal growth is faster than the vertical in the photo.
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Stephanie Martin September 08, 2012 05:40PM
Rob, I think this link explains it. This is usually a result of heat and cooling rates.

http://archive.org/details/MSFC-9902621

regards,
stephanie :-)
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Rob Woodside September 08, 2012 05:56PM
Thanks Stephanie, but I think Roger has a different specimen. His has both horizontal arms. In microgravity the growth should be the same in all symmetrically equivalent directions. Flames are spherical until the local oxygen is exhausted. So maybe I've answered my own question since the vertical growth is not as fast as the horizontal. Cool pictures, Thanks.
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Stephanie Martin September 08, 2012 06:01PM
Yes, that's what I was getting at. If it was in micro-gravity, the growth should be symmetrical. I agree, It is a great little gif.
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Ian Jones September 08, 2012 08:25PM
One from Cornwall, where most good things come from:-). http://www.mindat.org/photo-10613.html
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