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Cassiterite

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QRI685217

Cassiterite

Classic Locality

Description Tabs

Description
Locality: 
Wheal Ocean, St Agnes, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Cabinet (10-18 cm)
Size: 
7.4 × 13 × 4.5 cm
Largest Crystal: 
0.20cm
Description

Significant drusy hosting several dozens of lustrous cassiterite crystals on matrix. They are mostly pitch black with very well developed faces, and some of them are even bicolor (partially pale brown) and locally transparent.
Very rich and in good conditions. I did not remove the oxidation layer from the matrix in order to preserve the geologic signature.

Mineral Data
What's on the rock

Cassiterite

Formula: 
SnO2
Strunz: 
4.DB.05
Crystal System: 
Tetragonal
Hardness: 
6.0 - 7.0

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