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Genthelvite & Dolomite On Magnetite

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PMN742938

Genthelvite & Dolomite On Magnetite

Description Tabs

Description
Locality: 
Huanggang Mine, Hexigten Banner, Chifeng City, Inner Mongolia, China (Peoples Republic)
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
6 × 7 × 5 cm
Largest Crystal: 
1.00cm
Description

We don't see genthelvites from Inner Mongolie that often anymore - the finds seem to be over. This is an excellent form of the rare mineral and it contrasts nicely on attractive magenetite - also something that is no at all common. A good cabinet specimen that was collected some years ago.

Mineral Data
What's on the rock

Genthelvite

Formula: 
Zn4(Be3Si3O12)S
Strunz: 
9.FB.10
Hardness: 
6.0 - 6.5
Type Locality: 
West Cheyenne Canon, Cheyenne District (St. Peters Dome District), El Paso Co., Colorado, USA

Dolomite

Formula: 
CaMg(CO3)2
Strunz: 
5.AB.10
Crystal System: 
Trigonal - Rhombohedral
Hardness: 
3.5 - 4.0
Streak: 
White

Magnetite

Formula: 
Fe2+Fe3+2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
5.5 - 6.5
Streak: 
Black