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Sturmanite

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MGR1041966

Sturmanite

Classic Locality

Description Tabs

Description
Locality: 
NChwaning Mines, Kuruman, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 2.4 × 1.4 cm
Description

What we have here is maybe one of the most outstanding sturmanite specimen I have seen in a while. Lustrous faces, sharp edges, a pointed and undamaged tip and a highly esthetic crystal formation. This rare mineral is often very dull and unspactacular but not this one. Several crystals stacked on top of each other, exhibiting an incredible golden orange colour which is even translucent at some areas. This fine example represents exceptional quality for this rare species.

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

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Start 13 Apr 18:00
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