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Calcite Forms - (4)
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José Miguel




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PostPosted: Mar 23, 2010 05:15    Post subject: Re: Calcite Forms - (4)  

My contribution to the Calcite forms.


Calcite4.jpg
 Description:
China, Guiling, Guangxi. 4,5x1,7x1,2 cm
 Viewed:  24192 Time(s)

Calcite4.jpg



Calcite3..JPG
 Description:
Daye, Hubei, China. 8x4,7x2,5 cm
 Viewed:  24172 Time(s)

Calcite3..JPG



Calcite2.jpg
 Description:
Daye, Hubei, China. 7,3x7,5x2,2 cm
 Viewed:  24167 Time(s)

Calcite2.jpg



Calcite1.jpg
 Description:
Milliken (Sweetwater) mine, Viburnum Trend, Reynolds Co., Missouri. 7 x 6,5 x 12 cm
 Viewed:  24157 Time(s)

Calcite1.jpg


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Carles Curto
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PostPosted: Mar 28, 2010 15:36    Post subject: Re: Calcite Forms - (4)  

Elise wrote:
...maybe a better question is whether this shell is very very old, would it have been in a solution that leached the calcium out of shell and then the crystals formed out of that calcium rich solution? I am completely making this up.

To my knowledge the shell is empty and completely buried in a very fine grained mud, in a geological formation very rich in carbonate sediments (probably a shore). The organic part disappears and the walls of the shell operate as a pocket. The calcium of the fossil (it use to be aragonite) operates as a crystallization nucleus and the rest of the calcium necessary to form Calcite is added by the surrounding rock (marl or limestone) permitting the growth of crystals.

Similar processes of mineral growth into a fossil occur with Celestine inside coral, shells or algal formations, and Anapaite and Vivianite inside shells.
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Tobi




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PostPosted: Mar 29, 2010 03:47    Post subject: Re: Calcite Forms - (4)  

Hi Elise,

an interesting thread! Calcite is one of the most fascinating minerals and i would say it is among my all-time favourites, together with fluorite, tourmaline, garnet, beryl and quartz. Here are some impressions of calcite crystals from my collection.

Cheers!



CAL_Sweetwater.jpg
 Description:
Typical scalenohedral calcite from Sweetwater Mine, Missouri, USA. The largest one ends in two peaks. Specimen size 10 x 8 x 5 cm.
 Viewed:  24061 Time(s)

CAL_Sweetwater.jpg



CAL_Rammelsbach.jpg
 Description:
Reddish calcite scalenohedrons from Rammelsbach Quarry, Palatinate, Germany. Largest crystals in the picture have a lenght of 25 mm.
 Viewed:  24052 Time(s)

CAL_Rammelsbach.jpg



CAL_Landelies.jpg
 Description:
Translucent yellow calcite crystals from La Sambre Quarry near Landelies, Belgium. The largest crystals in the picture have a size of 25 mm.
 Viewed:  24068 Time(s)

CAL_Landelies.jpg


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Jordi Fabre
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PostPosted: Mar 29, 2010 11:44    Post subject: Re: Calcite Forms - (4)  

One more, this time from Spain.

BTW, thanks to Tracy Kimmel for the help in the translation-revision of the Carles Curto text about the "Calcite shell"!

Jordi



Doubly terminated Calcite La Florida Spain.jpg
 Description:
A classic from Spain. Waterclear like Dalnjegorsk, but Spaniard! ;-)
The crystal is very complex and has many faces among which the sharp rhombohedra and shortened scalenohedra stand out, giving it an equidimensional form.
La Florida Mines, La Florida, Cantabria, Spain
Specimen size: 10.5 × 5 × 3.5 cm.
Main crystal size: 2.2 × 2 cm.
Photo: Reference Specimens -> http://www.fabreminerals.com/specimens/RSES-spain-notable-specimens.php#NM46E6
 Viewed:  24023 Time(s)

Doubly terminated Calcite La Florida Spain.jpg



Doubly terminated Calcite detail La Florida Spain.jpg
 Description:
Detail of the Calcite
 Viewed:  24014 Time(s)

Doubly terminated Calcite detail La Florida Spain.jpg


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Tracy




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PostPosted: Mar 29, 2010 13:00    Post subject: Re: Calcite Forms - (4)  

My pleasure. :-)

- Tracy

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Tracy




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PostPosted: Mar 29, 2010 13:04    Post subject: Re: Calcite Forms - (4)  

By the way, the calcites appearing in this thread are really incredible. I have a weird one of my own to offer but it's really hard to photograph...and not all that attractive...just WEIRD, and with a neat history. I'll keep trying.

- Tracy

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Gerhard Niklasch




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PostPosted: Mar 29, 2010 15:55    Post subject: Re: Calcite Forms - (4)  

While these buttons may not be all that unusual, they've always struck me as Calcite trying hard (and failing) to pretend to be something else:
``When we grow up, we want to be ....Uvites!''
(Hm, if they were to turn their prisms through 30°, that would be a start...)
Canteras de mármol, Macael, Almería. Andalucía, Spain;
28x24x17mm overall size, acquired in September 2009, collection id 09ESCm001.



09ESCm001b.jpg
 Description:
They come in all sizes here, some frosted, some perfectly smooth...
 Viewed:  23943 Time(s)

09ESCm001b.jpg



09ESCm001dS.jpg
 Description:
Crossed-eyes stereo pair, field of view 9x15.4mm.
 Viewed:  23958 Time(s)

09ESCm001dS.jpg



09ESCm001fS.jpg
 Description:
Crossed-eyes stereo pair, field of view 12.5x17mm.
 Viewed:  24000 Time(s)

09ESCm001fS.jpg


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jamesb




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PostPosted: Mar 29, 2010 22:35    Post subject: Re: Calcite Forms - (4)  

I like it ! Esp #3.
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PostPosted: Apr 02, 2010 06:11    Post subject: Re: Calcite Forms - (4)  

This one from Morocco


Calcite El Hamman Morocco.jpg
 Description:
Group of fine laminar crystals of Calcite of hexagonal shape, with color zoning and small recrystallizations of the same Calcite in some areas of the piece.
El Hamman, Meknes Morocco
Specimen size: 9.3 × 5.4 × 4.2 cm.
Main crystal size: 2 × 1.8 cm.
Minor fluorescence long & short UV
Photo: Reference Specimens -> http://www.fabreminerals.com/specimens/RSSLV-silvane-notable-specimens.php#AZ6N4
 Viewed:  23829 Time(s)

Calcite El Hamman Morocco.jpg



Calcite El Hamman Morocco detail.jpg
 Description:
Detail
 Viewed:  23824 Time(s)

Calcite El Hamman Morocco detail.jpg


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Tobi




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PostPosted: Apr 02, 2010 10:24    Post subject: Re: Calcite Forms - (4)  

Gerhard, i would like to see more of these stereoscopic pictures. Can you post some more (only if it doesn't trouble you)?

Danke :-)
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Elise




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PostPosted: Apr 02, 2010 10:52    Post subject: Re: Calcite Forms - (4)  

Tobias Martin wrote:
Gerhard, i would like to see more of these stereoscopic pictures. Can you post some more (only if it doesn't trouble you)?Danke :-)

I would love to see more also - I started a thread on the topic somewhere else here a while ago, but maybe it got overlooked: https://www.mineral-forum.com/message-board/viewtopic.php?t=994 .

The growing calcite thread continues to be fascinating each time I get a chance to look back at it! Thank you for all the wonderful responses!

Best wishes,
Elise

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Antonio Alcaide
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PostPosted: Apr 02, 2010 13:17    Post subject: Re: Calcite Forms - (4)  

If you post one hexagonal shape calcite, I cannot stay still. :-)

One more, this time from the interesting chinese locality: Fozichong.

I did not know this type of calcites from Morocco. I think they can also be found in:

Charcas, Mexico.
Madrid, Spain.
St Andreasberg, St Andreasberg District, Harz Mts, Lower Saxony, Germany.

The classic prismatic examples from that last locality are amazing. I regret not having one of them to post it. Does anybody have?

Cheers



calcita.JPG
 Description:
Calcite. Pseudohexagonal shape. White zoning on top.
Fozichong. Wuzhou Prefecture. Guangxi Zhuang Autonomous Region. China
7 x 6 cm
Main crystal: 5 cm
 Viewed:  23812 Time(s)

calcita.JPG



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PostPosted: Apr 08, 2010 08:51    Post subject: Re: Calcite Forms - (4)  

From China too...


Calcite Yunnan China.jpg
 Description:
A curious crystalline growth that looks like a cup. The translucent crystal progressively increases its width from its base and at its termination it formed a very pronounced and deep hollow.
The specimen has been published in the book ‘China’, by Berthold Ottens, on page 386
Wenshan area, Yunnan, China
Mined in 2006
Specimen size: 6 × 4.3 × 3.8 cm.
Extremely fluorescent long & short UV
Photo: Reference Specimens -> http://www.fabreminerals.com/specimens/RSCN-china-notable-specimens.php#TT37K3
 Viewed:  23668 Time(s)

Calcite Yunnan China.jpg



Calcite Yunnan China top.jpg
 Description:
Top of the specimen
 Viewed:  23651 Time(s)

Calcite Yunnan China top.jpg


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PostPosted: Apr 08, 2010 09:24    Post subject: Re: Calcite Forms - (4)  

Since I can't compete with the photographic skills exhibited in this calcite thread, I'll have to try for humor: with a Norwegian moose for scale, here is the prism pair which started the thread as seen end on, showing the symmetry. Everyone who takes a look at this thinks it is beryl at first as they turn it over in their hand - they are quite surprised to find it is calcite. It is sitting next to my prize cleavage rhomb of "Iceland spar" from Helgustadir.

Cheers!
Elise



calcite.jpg
 Description:
Rhomb 65x45x35 mm
 Viewed:  23684 Time(s)

calcite.jpg



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PostPosted: Apr 08, 2010 13:01    Post subject: Re: Calcite Forms - (4)  

Ummm!!! Hexagonal calcites. My favourites!! Please, Elise, where do they come from?

Cheers

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Michael Shaw
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PostPosted: Apr 08, 2010 13:27    Post subject: Re: Calcite Forms - (4)  

Here's my contribution to this thread. The Annabel Lee Mine produced these calcites with unusual sceptered terminations around the mid 1980s. 5 x 6.5 cm.

The second image shows a calcite from the Fletcher Mine in the Viburnum Trend. The calcite has a reddish phantom presumably from included hematite. 6.5 cm.



1625 Calcite.jpg
 Description:
 Viewed:  23637 Time(s)

1625 Calcite.jpg



0664 Calcite.jpg
 Description:
 Viewed:  23632 Time(s)

0664 Calcite.jpg


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Carles Millan
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PostPosted: Apr 08, 2010 13:42    Post subject: Re: Calcite Forms - (4)  

Calcite

Hexagonal tabular colorless translucent crystals of calcite to 12 mm in size forming a 55 mm x 32 mm x 18 mm cluster. Undamaged. Ex Gene Tribbey collection.

Brevik, Porsgrunn, Telemark, Norway.



5463CM-calcite1.jpg
 Description:
 Viewed:  23614 Time(s)

5463CM-calcite1.jpg



5463M-calcite1.jpg
 Description:
 Viewed:  23630 Time(s)

5463M-calcite1.jpg


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Paul Bordovsky




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PostPosted: Apr 08, 2010 21:22    Post subject: Re: Calcite Forms - (4)  

Here is a specimen that I posted on the "faden" calcite thread, which is a misnomer.


P2147746bx (Large).jpg
 Description:
Calcite stalactite with hollow tube down the center. 11.3 x 1.3 cm.
 Viewed:  23621 Time(s)

P2147746bx (Large).jpg



P1132180a.jpg
 Description:
"Cave" calcite from Arkansas, USA.
 Viewed:  23573 Time(s)

P1132180a.jpg



P1132200a.jpg
 Description:
Another view or the "cave" calcite.
 Viewed:  23602 Time(s)

P1132200a.jpg


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PostPosted: Apr 08, 2010 21:33    Post subject: Re: Calcite Forms - (4)  

Champagne colored calcite crystals sitting on matrix. There are ten crystals that are well defined and gemmy. Specimen size is 170 x 110mm. The largest crystal is 47 x 60 mm.

Laogaoshan deposit, Liujiang Co., Liuzhou Prefecture, Guangxi Zhuang Autonomous Region, China



01chinacalcite.jpg
 Description:
 Viewed:  23561 Time(s)

01chinacalcite.jpg



94chinacalcite.jpg
 Description:
 Viewed:  23576 Time(s)

94chinacalcite.jpg


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am mizunaka




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PostPosted: Apr 09, 2010 01:16    Post subject: Re: Calcite Forms - (4)  

Here's my calcite pick.


ChineseMF.jpg
 Description:
Wuzhou Prefecture, Guangxi Zhuang Autonomous Region, China. 10 x 5 X 4.5 cm
 Viewed:  23503 Time(s)

ChineseMF.jpg


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