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Arthurite & Pharmacosiderite

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RPL1071498

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Description
Locality: 
Hingston Down Consols, Calstock, Cornwall, United Kingdom
Class: 
Massive/Crystalline
Size Range: 
Miniature (4.5-7 cm)
Size: 
6 × 5 × 4.5 cm
Weight: 
172.00gr
Description

A rich, bright green crust of micro crystals of arthurite with toffee brown pharmacosiderite on quartz and granite matrix, minor arthurite throughout.

Requires magnification to appreciate fully.

Mineral Data
What's on the rock

Arthurite

Formula: 
CuFe3+2(AsO4)2(OH)2·4H2O
Strunz: 
8.DC.15
Crystal System: 
Orthorhombic
Hardness: 
3.0 - 4.0
Type Locality: 
Hingston Down Consols, Clitters United Mines, Gunnislake, Calstock, Callington District, Cornwall, England, UK

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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Start 17 Sep 18:00
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UK Inland
£4.50
Europe
£11.50
Rest of World
£11

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