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Josele
Joined: 10 Apr 2012
Posts: 405
Location: Tarifa, Spain
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Posted: Nov 04, 2017 18:05 Post subject: Fluorite habit |
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No matter how hard I try, I'm not able to understand this crystal. The smaller at top looks like a cube modified by the dodecahedron. But these triangular faces at reflex, there is a step in the diagonal of a cube face?
Please, if somebody can enlight me...
Thanks.
Mineral: | Fluorite |
Locality: | Camissinone Mine, Zogno, Brembana Valley, Bergamo Province, Lombardy/Lombardia, Italy | |
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Dimensions: | FoV: 23 cm |
Description: |
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_________________ Josele |
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marco campos-venuti
Joined: 09 Apr 2014
Posts: 206
Location: Sevilla
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Posted: Nov 04, 2017 19:06 Post subject: Re: Fluorite habit |
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It looks as a purple cube with a clear interior. The two faces are cleavage faces showing the interior of the crystal, cutting two vertex of the cube.
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Bob Harman
Joined: 06 Nov 2015
Posts: 765
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Posted: Nov 04, 2017 20:40 Post subject: Re: Fluorite habit |
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I agree with MARCO. In the southern Illinois fluorite district the locals that had access to fluorite passed the time perfecting their skills cleaving pieces of the mineral into fluorite octahedrons.....fluorite diamonds. They are now commonly available in many different colors and sizes.
The one shown is a partial preferentially cleaved fluorite cube. Partially natural and partially man created. BOB
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Jesse Fisher
Joined: 18 Mar 2009
Posts: 628
Location: San Francisco
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Posted: Nov 04, 2017 20:46 Post subject: Re: Fluorite habit |
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The crystal appears to be a cubic fluorite, which is transparent on the interior with a dark surface layer.. The cube has been cleaved on the octahedral plane (111) on two adjacent sides. revealing the interior and mimicking an octahedral form. It is unlikely that this is the "natural" habit of the crystal.
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Josele
Joined: 10 Apr 2012
Posts: 405
Location: Tarifa, Spain
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Posted: Nov 05, 2017 06:13 Post subject: Re: Fluorite habit |
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Oh, now I see it, I had not thought about the possibility of man-made cleaved faces.
Thanks for your help.
Mineral: | Fluorite |
Locality: | Camissinone Mine, Zogno, Brembana Valley, Bergamo Province, Lombardy/Lombardia, Italy | |
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Dimensions: | FoV: 23 cm |
Description: |
Something like this?
Photo © Frédéric Hède |
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Pete Richards
Site Admin
Joined: 29 Dec 2008
Posts: 828
Location: Northeast Ohio
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Posted: Nov 05, 2017 14:49 Post subject: Re: Fluorite habit |
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Too bad! It would be a magnificent specimen if it was natural. But I agree with the assessments offered. Perhaps there are two more cleavage planes on the back....
The smaller crystals reveal the fakery applied to the larger one.
_________________ Collecting and studying crystals with interesting habits, twinning, and epitaxy |
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