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Sturmanite

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RAF134348

Sturmanite

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 2.5 cm
Largest Crystal: 
0.80cm
Description

Some fine sturmanite crystals on massive that came out from N'Chwaning II Mine. Light contact marks can be viewed in pictures.

Weight: 179 gr.

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