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Olmiite With Calcite

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SMS1040487

Olmiite With Calcite

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystal Group/Cluster
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.1 × 4.2 × 1.4 cm
Largest Crystal: 
0.80cm
Weight: 
49.96gr
Description

The specimen consists of a single crystal of olmiite with some prismatic crystals of calcite on a schard of country rock. The olmiite measures 8mm with good lustre and semi-translucent qualities. Very nice specimen.

Mineral Data
What's on the rock

Olmiite

Formula: 
CaMn2+[SiO3(OH)](OH)
Strunz: 
9.AF.90
Hardness: 
5.0 - 5.5
Streak: 
White
Type Locality: 
N'Chwaning II Mine, N'Chwaning Mines, Kuruman, 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

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