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Sturmanite & Calcite On Hematite

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SMS1077085

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small cabinet (7-10 cm)
Size: 
5.4 × 7 × 0.9 cm
Weight: 
34.73gr
Description

The specimen has a thin bow shaped plate that makes up the hematite ore matrix with a deposit of sturmanite on the top surface and with water clear calcite crystals and black manganite on the underside. The sturmanite are a deep transparent golden yellow colour. Not all the sturmanite are complete.

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

Calcite

Polymorph of: 
Aragonite and Vaterite
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White

Hematite

Formula: 
Fe2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
5.0 - 6.0

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