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Manganite & Hausmannite On Sturmanite

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SMS1084361

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Cabinet (10-18 cm)
Size: 
6.3 × 10.8 × 4.9 cm
Weight: 
251.43gr
Description

The specimen has the appearance of something built from a modular unit such as bricks. In this instance the unit of building was dipyramidal hexagonal disc crystals of sturmanite. On the front side a series of cave-like hollow forms are put together in mass form and in lining the cavities with hexagonal discs one upon the other or next to each other. The sturmanite is nearly all opaque caramel coloured crystals and masses. There are scattered concentrations of tiny crystals of hausmannite with manganite on both sides of the specimen.

Mineral Data
What's on the rock

Manganite

Formula: 
Mn3+O(OH)
Strunz: 
4.FD.15
Hardness: 
4.0
Type Locality: 
Manganese deposit, Ilfeld, Nordhausen, Harz, Thuringia, Germany

Hausmannite

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

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

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$12
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$16
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$14
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$18
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$14
Rest of world up to 1 kilogram
$18
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