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Quartz On Manganoan Calcite

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SMS1032671

Quartz On Manganoan Calcite

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Description
Locality: 
NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa
Class: 
Combination
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.3 × 2 × 1.2 cm
Weight: 
8.53gr
Description

A small shard of matrix with a ditrigonal scalenohedral crystal os calcite attached. The calcite is covered with a deposit of drusy quartz, showing some pale pink colour as well as frosty colour because of what is underneath. The matrix shard also has a drusy quartz deposit except along a narrow contact line.

Mineral Data
What's on the rock

Quartz

Formula: 
SiO2
Strunz: 
4.DA.05
Crystal System: 
Trigonal
Hardness: 
7.0
Streak: 
White

Manganoan Calcite

Variety Of: 

Calcite

Formula: 
CaCO3
Strunz: 
5.AB.05
Hardness: 
3.0
Formula: 
(Ca,Mn)CO3
Hardness: 
0.0

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