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Sturmanite

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QRI997435

Sturmanite

Classic Locality

Description Tabs

Description
Locality: 
NChwaning Mines, Kuruman, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.6 × 2.8 × 2.5 cm
Largest Crystal: 
1.20cm
Weight: 
42.00gr
Description

Dramatic specimen featuring numerous textbook saturated yellow-green sturmanite crystals of excellent quality upon the classic Mn oxide rich matrix. 

Incredible contrast and quality, this is a remarkable specimen of its kind, nowadays very sought-after.

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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