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Pharmacosiderite & Scorodite

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PDM631424

Pharmacosiderite & Scorodite

Classic Locality

Description Tabs

Description
Locality: 
Wheal Gorland, St Day, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
4.8 × 2.7 × 1.2 cm
Description

Green cubic crystals of pharmacosiderite with very good vitreous lustre, lining geodes of a quartz matrix with light blue scorodite. Classic European Material.

Acquired in 1959, the specimen is from the collection of Georges Vanacker*, a well-known Belgian systematic collector.

*Vanackerite (from Tsumeb) is named after him.

Mineral Data
What's on the rock

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

Scorodite

Formula: 
Fe3+AsO4·2H2O
Strunz: 
8.CD.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.0
Type Locality: 
Stamm Asser Mine, Graul, Langenberg, Schwarzenberg District, Erzgebirge, Saxony, Germany

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