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Braunite-II & Andradite With Calcite

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SMS1040893

Braunite-II & Andradite With Calcite

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Description Tabs

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: 
1.7 × 4.2 × 3 cm
Largest Crystal: 
1.80cm
Weight: 
32.33gr
Description

The specimen is small piece of the ore body made up of braunite II with andradite and calcite. Some crystals to a good size at 1.8cm and 1.3cm. One can clearly pick up the bipyramidal crystal habit. The pyramidal terminations are quite extended creating a relatively elongate proportion for the habit.

Mineral Data
What's on the rock

Andradite

Formula: 
Ca3Fe3+2(SiO4)3
Strunz: 
9.AD.25
Crystal System: 
Isometric
Hardness: 
6.5 - 7.0
Streak: 
White
Type Locality: 
Drammen, Buskerud, Norway

Calcite

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

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