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José Miguel
Joined: 09 Apr 2007
Posts: 157
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Posted: Mar 23, 2010 05:15 Post subject: Re: Calcite Forms - (4) |
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My contribution to the Calcite forms.
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China, Guiling, Guangxi. 4,5x1,7x1,2 cm |
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Daye, Hubei, China. 8x4,7x2,5 cm |
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Daye, Hubei, China. 7,3x7,5x2,2 cm |
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Milliken (Sweetwater) mine, Viburnum Trend, Reynolds Co., Missouri. 7 x 6,5 x 12 cm |
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Carles Curto
Joined: 14 Sep 2006
Posts: 160
Location: Barcelona
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Posted: Mar 28, 2010 15:36 Post subject: Re: Calcite Forms - (4) |
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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
Site Admin
Joined: 07 Apr 2009
Posts: 4105
Location: Germany
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Posted: Mar 29, 2010 03:47 Post subject: Re: Calcite Forms - (4) |
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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!
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Typical scalenohedral calcite from Sweetwater Mine, Missouri, USA. The largest one ends in two peaks. Specimen size 10 x 8 x 5 cm. |
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Reddish calcite scalenohedrons from Rammelsbach Quarry, Palatinate, Germany. Largest crystals in the picture have a lenght of 25 mm. |
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Translucent yellow calcite crystals from La Sambre Quarry near Landelies, Belgium. The largest crystals in the picture have a size of 25 mm. |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4896
Location: Barcelona
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Posted: Mar 29, 2010 11:44 Post subject: Re: Calcite Forms - (4) |
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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
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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 |
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Tracy
Joined: 15 Sep 2006
Posts: 551
Location: Toronto
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Posted: Mar 29, 2010 13:00 Post subject: Re: Calcite Forms - (4) |
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My pleasure. :-)
- Tracy
_________________ "Wisdom begins in wonder" - Socrates |
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Tracy
Joined: 15 Sep 2006
Posts: 551
Location: Toronto
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Posted: Mar 29, 2010 13:04 Post subject: Re: Calcite Forms - (4) |
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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
_________________ "Wisdom begins in wonder" - Socrates |
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Gerhard Niklasch
Joined: 27 Mar 2009
Posts: 134
Location: Munich
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Posted: Mar 29, 2010 15:55 Post subject: Re: Calcite Forms - (4) |
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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.
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They come in all sizes here, some frosted, some perfectly smooth... |
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Crossed-eyes stereo pair, field of view 9x15.4mm. |
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Crossed-eyes stereo pair, field of view 12.5x17mm. |
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jamesb
Joined: 16 Jan 2010
Posts: 18
Location: Arizona
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Posted: Mar 29, 2010 22:35 Post subject: Re: Calcite Forms - (4) |
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I like it ! Esp #3.
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4896
Location: Barcelona
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Posted: Apr 02, 2010 06:11 Post subject: Re: Calcite Forms - (4) |
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This one from Morocco
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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 |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4105
Location: Germany
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Posted: Apr 02, 2010 10:24 Post subject: Re: Calcite Forms - (4) |
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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
Joined: 22 Dec 2009
Posts: 243
Location: New York State
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Posted: Apr 02, 2010 10:52 Post subject: Re: Calcite Forms - (4) |
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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
_________________ Elise Skalwold |
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Antonio Alcaide
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Joined: 23 Aug 2009
Posts: 314
Location: Spain
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Posted: Apr 02, 2010 13:17 Post subject: Re: Calcite Forms - (4) |
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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
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Calcite. Pseudohexagonal shape. White zoning on top. Fozichong. Wuzhou Prefecture. Guangxi Zhuang Autonomous Region. China 7 x 6 cm Main crystal: 5 cm |
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_________________ Life is the shortest crystal |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 4896
Location: Barcelona
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Posted: Apr 08, 2010 08:51 Post subject: Re: Calcite Forms - (4) |
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From China too...
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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 |
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Elise
Joined: 22 Dec 2009
Posts: 243
Location: New York State
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Posted: Apr 08, 2010 09:24 Post subject: Re: Calcite Forms - (4) |
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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
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_________________ Elise Skalwold |
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Antonio Alcaide
Site Admin
Joined: 23 Aug 2009
Posts: 314
Location: Spain
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Posted: Apr 08, 2010 13:01 Post subject: Re: Calcite Forms - (4) |
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Ummm!!! Hexagonal calcites. My favourites!! Please, Elise, where do they come from?
Cheers
_________________ Life is the shortest crystal |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2068
Location: Oklahoma
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Posted: Apr 08, 2010 13:27 Post subject: Re: Calcite Forms - (4) |
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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.
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Carles Millan
Site Admin
Joined: 05 May 2007
Posts: 1470
Location: Catalonia
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Posted: Apr 08, 2010 13:42 Post subject: Re: Calcite Forms - (4) |
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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.
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Paul Bordovsky
Joined: 07 Nov 2008
Posts: 46
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Posted: Apr 08, 2010 21:22 Post subject: Re: Calcite Forms - (4) |
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Here is a specimen that I posted on the "faden" calcite thread, which is a misnomer.
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Calcite stalactite with hollow tube down the center. 11.3 x 1.3 cm. |
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"Cave" calcite from Arkansas, USA. |
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Another view or the "cave" calcite. |
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Paul Bordovsky
Joined: 07 Nov 2008
Posts: 46
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Posted: Apr 08, 2010 21:33 Post subject: Re: Calcite Forms - (4) |
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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
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am mizunaka
Joined: 09 Apr 2010
Posts: 2039
Location: USA
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Posted: Apr 09, 2010 01:16 Post subject: Re: Calcite Forms - (4) |
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Here's my calcite pick.
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Wuzhou Prefecture, Guangxi Zhuang Autonomous Region, China. 10 x 5 X 4.5 cm |
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33287 Time(s) |
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