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Calcite Forms - (4)
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Elise




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PostPosted: Jul 22, 2010 09:00    Post subject: Re: Calcite Forms - (4)  

We have a question about cobalt calcite such as Jordi posted above https://www.mineral-forum.com/message-board/viewtopic.php?p=12126&highlight=#12126
We have a druzy which goes by "cobaltocalcite" (and other names). But under magnification the crystals appear orthorhombic. Is there such a thing as "cobalt aragonite" which would have this same color, or are the crystals so distorted sometimes in the cobalt calcite that they would appear not to fit calcite's forms?

My understanding is that in the cobalt calcite the cause of the color is bivalent Co in the octahedral site causing the amazing pink color in Jordi's specimen; I was contrasting that with bivalent cobalt in tetrahedral coordination in spinel causing the blue of "cobalt spinel" (as an example of the same chromophore causing radically different color in different ion coordinations and taking that further into a discussion of geometry affecting absorption of light). Then someone pointed out to me that the druzy doesn't look like calcite, but rather the polymorph aragonite...which blew my whole mini-project out of the water. I went back to study aragonite and whether it occurs in this color and if so, whether cobalt could would be in the same location - but, I don't find any mention of aragonite with cobalt. So asking collectors.

I am trying to get a photomicrograph, but with no luck so far of getting enough detail - perhaps others have some images of cobalt calcite druzy to which I could compare what I have in hand.

As a total distraction, attached is an aragonite with cyclic twinning making it appear hexagonal. I am holding out for a pink calcite that appears orthorhombic....

Elise



aragonitetwin.jpg
 Description:
twinned aragonite
 Viewed:  66728 Time(s)

aragonitetwin.jpg



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Elise




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PostPosted: Jul 22, 2010 13:07    Post subject: Re: Calcite Forms - (4)  

uh oh, I am replying to my own post with belated insights from my collaborator - after looking at what I posted above, he wrote: "Well, I have spent the last hour or two looking at images of druzy (drusy) calcite and aragonite. The image you included on your inquiry looks nothing like ours. Everything about his druzy (Jordi's) says calcite, especially the rhombohedra. But here is a druzy-like pink aragonite: https://www.mindat.org/photo-142081.html . Don’t know if it is due to cobalt. Here is more pink druzy aragonite but not much like ours: https://www.mindat.org/photo-142150.html . I thought I saw blades, nothing as beautiful as this however: https://www.mindat.org/photo-186107.html . More like this: https://www.mindat.org/photo-35569.html . But then I went to drusy calcite and found images that look just like our specimen. One thing that makes me lean back toward ours being calcite is that the cleavage I observed in ours was what I would call perfect whereas , aragonite has imperfect cleavage. The only remaining problem with ours being calcite is the complete lack of rhombohedral crystal faces or rhombohedral cleavage – but that could simply be due to the way the crystals are all crowded into the site. Oh well, let me know what kind of feedback you get. I lean more toward it being calcite at this point."

Maybe now I can go back to my original project of cobalt calcite and cobalt spinel - but I would still enjoy seeing more examples of cobalt calcite and pink aragonite.

Cheers!
Elise

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kywawa




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PostPosted: Jul 31, 2010 03:51    Post subject: Re: Calcite Forms - (4)  

Oh,god..it's too beautiful and attractive.
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am mizunaka




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PostPosted: Aug 08, 2010 05:06    Post subject: Re: Calcite Forms - (4)  

Calcite within calcite crystals and the tiny tip of another poking out the top termination.


Bor2Calcite.jpg
 Description:
Calcite from Bor Quarry Dalnegorsk Russia
 Viewed:  66432 Time(s)

Bor2Calcite.jpg


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nicu




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PostPosted: Sep 05, 2010 00:22    Post subject: Re: Calcite Forms - (4)  

Hi,

I add here a few Calcites from my collection



342-Calcita neagra si calcita alba-Herja-1.JPG
 Description:
Black and White Calcite, Herja Mine, Maramures, Romania
size specimen 15x8x8 cm
collected in 1985
 Viewed:  66207 Time(s)

342-Calcita neagra si calcita alba-Herja-1.JPG



342-Calcita neagra si calcita alba-Herja-2.JPG
 Description:
Black and White Calcite
Another photo
 Viewed:  66215 Time(s)

342-Calcita neagra si calcita alba-Herja-2.JPG



346-Cavnicit-Calcite cu incluziuni de oxizi de Fe-Cavnic-1.JPG
 Description:
Calcite of Cavnic, Maramures, Romania, folk name 'Cavnicit'
specimen size: 9x6x5 cm
collected in 1986
spherical groups of brownish radials crystals, main crystal size 15 mm
Fe-oxide inclusions
 Viewed:  66211 Time(s)

346-Cavnicit-Calcite cu incluziuni de oxizi de Fe-Cavnic-1.JPG



346-Cavnicit-Calcite cu incluziuni se oxizi de Fe-Cavnic-2.JPG
 Description:
'Cavnicit'
Another photo
 Viewed:  66246 Time(s)

346-Cavnicit-Calcite cu incluziuni se oxizi de Fe-Cavnic-2.JPG



82-5.JPG
 Description:
Black Calcite from Herja, Maramures, Romania
specimen size: 17x11x16 cm
 Viewed:  66158 Time(s)

82-5.JPG



369-1.JPG
 Description:
Yellow Calcite from Iara Mine, Cluj dep., Romania
specimen size: 9x7x4 cm
 Viewed:  66189 Time(s)

369-1.JPG



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Elise




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PostPosted: Mar 28, 2011 15:37    Post subject: Re: Calcite Forms - (4)  

Pete Richards wrote:
Certainly Elise's specimen is consistent with the famous dolomite twins from Eugui. But examples of calcite twinned in this morphology are also known. It's worth checking out, but I think the similarity to Eugui dolomite is not conclusive. Simple tests would easily resolve the question, including the rate of fizz in dilute HCl compared to known calcite and dolomite examples.

One year later, I finally was able to get into the case today to retrieve the suspect specimen labeled Calcite: https://www.mineral-forum.com/message-board/viewtopic.php?p=10730&highlight=#10730 A tiny drop of 10% nitric acid on a discreet part of the crystal had almost no visible fizzing (a drop on sample of calcite fizzed crazily). While it shows how much work is ahead of me checking labels all through the museum, it was also a lesson in not believing everything one reads, no matter the context (in this case a mineral museum). When writing or editing I use multiple references and cross-check everything in them, having found errors in textbooks, scientific papers, articles - not all with subsequent published erratum. But, just as Pete pointed out, my coworker said that it could not be a sight-ID as calcite can also look just like this. Now I am looking for the acquisition records to find out if there is any information about origin. In learning about minerals and mineral collecting over the past couple years, one revelation has been the amazing aspect of locality types and that collectors recognize them quickly, as Jordi and others recognized this dolomite. I went by morphology from a distance and a prejudiced love of calcite....along with the tag.
Cheers!
Elise
PS: I was also able to pull out a specimen labeled sphaerocolbaltite - discredited in Fleisher's 2008, but what if I had only looked in Bayliss.....lovely color though.

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javmex2




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PostPosted: May 09, 2011 16:30    Post subject: Re: Calcite Forms - (4)  

Some from Mexico.


DSC00541.JPG
 Description:
Hercules, Coahuila, Mexico
Collected in 1992.
 Viewed:  63849 Time(s)

DSC00541.JPG



DSC00523.JPG
 Description:
Naica, Chihuahua, Mexico
Collected in past days this month
 Viewed:  63854 Time(s)

DSC00523.JPG



DSC00442.JPG
 Description:
Mapimí, Durango, Mexico
Size: 15 cms
Collected in 2009.
 Viewed:  63866 Time(s)

DSC00442.JPG


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am mizunaka




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PostPosted: Jul 19, 2011 22:14    Post subject: Re: Calcite Forms - (4)  

A few more examples.


SandCalcite1.jpg
 Description:
Calcite with Sand Inclusions
Bellecroix, Fontainebleau, Seine-et-Marne, Ile-de-France, France
6 x 3.6 cm
 Viewed:  63251 Time(s)

SandCalcite1.jpg



CalciteMtns.jpg
 Description:
Calcite
Interior, Jackson Co., South Dakota
10.2 x 5.8 cm
 Viewed:  63218 Time(s)

CalciteMtns.jpg



CalciteMtns3.jpg
 Description:
Calcite (Top View)
Interior, Jackson Co., South Dakota
10.2 x 5.8 cm
 Viewed:  63211 Time(s)

CalciteMtns3.jpg


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am mizunaka




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PostPosted: Oct 25, 2012 23:26    Post subject: Re: Calcite Forms - (4)  




CalciteSiderite2.jpg
 Description:
Calcite on Siderite
Herja Mine, Baia Mare, Maramure Co., Romania
7.5 x 4.5 cm.
 Viewed:  59421 Time(s)

CalciteSiderite2.jpg


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mihailovici79




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PostPosted: Oct 26, 2012 12:45    Post subject: Re: Calcite Forms - (4)  

Calcite from Romania:


calcit 002.jpg
 Description:
Calcite, Ciclova,Romania
 Viewed:  59404 Time(s)

calcit 002.jpg



calcit 003.jpg
 Description:
Calcite, ?, Romaina
 Viewed:  59410 Time(s)

calcit 003.jpg



calcit_m 003.jpg
 Description:
Calcite, Ocna de Fier, Romania
 Viewed:  59373 Time(s)

calcit_m 003.jpg



calcita 008.jpg
 Description:
Calcite, Metaliferi Mountains, Romania
 Viewed:  59359 Time(s)

calcita 008.jpg


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alex chaus




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PostPosted: Oct 28, 2012 21:08    Post subject: Re: Calcite Forms - (4)  

Hi, all.
Some contribution to calcite theme from Kyrgyzstan. All images provided are from the same location - Tereksay stibnite mine, collected at different levels during 80th to 2000 years. rusty film on some crystals is iron oxide hard to remove (any advise how to?). Sorry for images bad quality they are just from my catalog.
Alex



01046.JPG
 Description:
Calcite twin
Tereksay mine
5 by 3 cm
 Viewed:  58874 Time(s)

01046.JPG



01431.JPG
 Description:
Calcite on quartz plates
Tereksay mine
big crystal about 3 by 3 cm, specimen about 20 by 20 cm
 Viewed:  58948 Time(s)

01431.JPG



00952.JPG
 Description:
Calcite (complicated shape)
Tereksay mine
13 by 15 cm
 Viewed:  58898 Time(s)

00952.JPG


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GneissWare




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PostPosted: Oct 28, 2012 21:29    Post subject: Re: Calcite Forms - (4)  

alex chaus wrote:
Hi, all.
rusty film on some crystals is iron oxide hard to remove (any advise how to?).
Alex


Hi Alex,
In some parts of the world you can get Super Iron Out (google Super Iron Out MSDS for the chemistry). It is a buffered mix of Sodium hydrosulfite and Sodium metabisulfite. You can try it on a sample to make sure it doesn't etch the Calcite.
Bob
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alex chaus




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PostPosted: Oct 28, 2012 23:51    Post subject: Re: Calcite Forms - (4)  

Thank you, Bob, I'll try to find or get it from somewhere abroad.
Alex
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Elise




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PostPosted: Nov 29, 2012 17:31    Post subject: Re: Calcite Forms - (4)  

The "Calcite (complicated shape) Tereksay mine" specimen is very interesting!

Below is a neat specimen I've been trying to photograph. It has copper inclusions just under the surface which sparkle in the light, no luck showing that here yet. Some of the inclusions stick out of the faces. This is from Hancock, MI.

Cheers,
Elise



CalciteCu_0132sm.jpg
 Description:
Calcite included with Copper
Hancock, MI
10 x 8 x 5 cm
 Viewed:  58720 Time(s)

CalciteCu_0132sm.jpg



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PostPosted: Nov 29, 2012 17:46    Post subject: Re: Calcite Forms - (4)  

and one more - I was trying to capture the curved growth features on the crystal faces; turned into blow-out areas, but more or less shows it. This is from Sweetwater Mine, MO. The calcite is on galena, but the latter is not visible in this view.

Elise



calcite_152_sm.jpg
 Description:
Calcite on Galena
Sweetwater Mine, MO
7 x 4,5 x 2 cm
 Viewed:  58683 Time(s)

calcite_152_sm.jpg



calcite_94sm.jpg
 Description:
Calcite on Galena
Sweetwater Mine, MO
7 x 4,5 x 2 cm
 Viewed:  58631 Time(s)

calcite_94sm.jpg


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