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PhotosPyrite - Cakmakkaya Mine, Murgul Cu-Zn-Pb deposit, Murgul, Artvin Province, Black Sea Region, Turkey

16th Jun 2013 11:03 UTCErik Vercammen Expert

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Pyrite
Cakmakkaya Mine, Murgul Cu-Zn-Pb deposit (Murgul copper deposit), Murgul District, Artvin Province, Turkey
Copyright © Thames Valley Minerals/e-Rocks
This crystal is formed by the 12 faces of the pyritohedron combined with the 8 faces of the octahedron: there are 2 types of edges with a (slightly) different length. It isn't a twin, but it is a large and welll formed example of this combination, and the 2 forms are neatly in equilibrium.

16th Jun 2013 14:47 UTCUwe Kolitsch Manager

Message sent.

10th Oct 2014 16:17 UTCRob Woodside 🌟 Manager

Fixed

10th Oct 2014 19:15 UTCPeter Haas

I'm not so sure ...


While an icosahedron can be constructed by combining a pyritohedron with an octahedron, there also exists a regular icosahedron (with edges of equal length) as an independent isometric form.

10th Oct 2014 21:21 UTCErik Vercammen Expert

The icosahedron does't occur in pyrite, it only occurs in quasi-crystals, with one known mineral (from meteorites): icosahedrite.
 
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