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Spinel In Calcite

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JZM890470

Spinel In Calcite

Description Tabs

Description
Locality: 
Antsiriky, Anosy, Madagascar
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
4.4 × 4.2 × 3.2 cm
Largest Crystal: 
0.50cm
Weight: 
79.00gr
Description

This typical sample from the Anosoy region shows hundreds of black lustrous spinel crystals up to 5 mm intergrown in orange calcite matrix.

Mineral Data
What's on the rock

Spinel

Formula: 
MgAl2O4
Strunz: 
4.BB.05
Crystal System: 
Isometric
Hardness: 
7.5 - 8.0

Calcite

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

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