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Sturmanite

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MGR772579

Sturmanite

Floater

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.6 × 4.2 × 2.5 cm
Description

The specimen is developed as floater, consisting of sharp, well developed crystals. Their faces show some very attractive structures and the end-point shows sharp and interesting modifications. Although there are a few contacts of inter-grown crystals we can judge this as very good, impressive and uncommon specimen. Should be high valued for the famous classic locality!

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