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Sturmanite

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GMN1174553

Description Tabs

Description
Locality: 
Wessels Mine, Hotazel, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4 × 2.5 × 2 cm
Description

A rich coverage of brown sturmanite crystals  on matrix.

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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10
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Start 30 Mar 18:00
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