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Chalcophyllite

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MMM27528

Chalcophyllite

Description Tabs

Description
Locality: 
Wheal Gorland, St Day, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.5 × 5 × 3 cm
Description

Good old time specimen from Wheal Gorland displaying pockets in cuprite, quartz matrix lined with translucent chalcophyllite crystals to 2 mm. There are also some smaller crystals that have been altered to chrysocolla.

Wonderful under a lens.

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