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Sturmanite & Hausmannite

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RAF710797

Sturmanite & Hausmannite

Rare Mineral

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Museum (18cm plus)
Size: 
20.9 × 13.6 × 5.6 cm
Largest Crystal: 
0.70cm
Weight: 
5 050.00gr
Description

Nice Sturmanite & Hausmannite. An old specimen, it came out 20 years ago.   This is an extremely heavy specimen, over 5 kg, and shipping on this specimen will be US $150.00

Mineral Data
What's on the rock

Sturmanite

Formula: 
Ca6(Fe3+,Al,Mn3+)2(SO4)2[B(OH)4](OH)12·25H2O
Strunz: 
7.DG.15
Crystal System: 
Trigonal
Hardness: 
2.5
Type Locality: 
Black Rock Mine, Black Rock, Kalahari manganese field, Northern Cape Province, South Africa

Hausmannite

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