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Chalcophyllite

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BCK502876

Chalcophyllite

Description Tabs

Description
Locality: 
Wheal Unity, Gwennap, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.6 × 1.2 × 1 cm
Description

You are bidding on a small specimen with some very nice groups of chalcophyllite crystals on matrix from this classic locality. 

Mineral Data
What's on the rock

Chalcophyllite

Formula: 
Cu18Al2(SO4)3(AsO4)3(OH)27·33H2O
Strunz: 
8.DF.30
Crystal System: 
Trigonal
Hardness: 
2.0

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