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Chalcophyllite & Pharmacosiderite

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MMM37689

Chalcophyllite & Pharmacosiderite

Description Tabs

Description
Locality: 
Cathedral Mine, Busveal, St Day, Cornwall, United Kingdom
Size Range: 
Miniature (4.5-7 cm)
Size: 
2.5 × 5 × 4 cm
Description

Lustrous micro crystalline green chalcophyllite with scorodite on arsenopyrite, quartz matrix.

Rare location specimen.

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

Pharmacosiderite

Formula: 
KFe3+4(AsO4)3(OH)4·6-7H2O
Strunz: 
8.DK.10
Hardness: 
2.5
Streak: 
white
Type Locality: 
Carharrack Mine, St Day United Mines (Poldice Mines), Gwennap, Camborne - Redruth - St Day District, Cornwall, England, UK
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