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Sturmanite

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RAF719756

Sturmanite

Rare Mineral

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Single Crystal
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.3 × 1.2 × 0.8 cm
Largest Crystal: 
3.30cm
Weight: 
4.00gr
Description

A nice Sturmanite crystal. A fine thumbnail.

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