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Gaudefroyite & Hausmannite

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CHP1136852

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Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 2.2 × 1.5 cm
Description

specimen with some prismatic black crystals of gaudefroite with associate many grey-black crystals of metallic hausmannite on matrix.

c. A798

Mineral Data
What's on the rock

Gaudefroyite

Formula: 
Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3
Strunz: 
6.AB.60
Hardness: 
6.0
Type Locality: 
Tachgagalt Mine, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco

Hausmannite

Formula: 
Mn2+Mn3+2O4
Strunz: 
4.BB.10
Hardness: 
5.5
Type Locality: 
Oehrenstock (Öhrenstock), Langewiesen, Ilmenau District, Thuringian Forest, Thuringia, Germany

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35
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Start 03 Jan 18:00
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