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Olmiite & Calcite

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RAF736046

Olmiite & Calcite

Gem Crystal

Description Tabs

Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.3 × 4 × 1.1 cm
Largest Crystal: 
1.50cm
Weight: 
24.00gr
Description

One large beautiful Olmiite crystal surrounded by smaller Calcite crystals on matrix from N'Chwaning II Mine, Northern Cape. Has been sawn on two sides.   Olmiite and calcite is scarce.

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: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White