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Sturmanite

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VCV159254

Sturmanite

Description Tabs

Description
Locality: 
NChwaning I Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 0.4 × 0.4 cm
Largest Crystal: 
1.30cm
Description

A very nice small well terminated prismatic crystal of translucent yellow sturmanite.

Not often seen in this quality these days.

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
Vic's Vugh Minerals