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Stannoidite In Arsenopyrite With Scorodite

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PDM996832

Stannoidite In Arsenopyrite With Scorodite

Description Tabs

Description
Locality: 
Cligga Head, Perranporth, Cornwall, United Kingdom
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.4 × 1.3 × 1 cm
Description

Interpenetrated crystals of silver coloured arsenopyrite with the intracrystalline space filled by stannoidite (Moore & Howie, 1984). The cavities at the surfaces are richly covered by green scorodite. It was classified as stannoidite, but probably a detailed study is necessary to determine if that rare species is also present in this specimen.

Ex Francis Hubert # 13302.

Combine specimens to reduce shipping costs!.

 

Moore, F. & Howie, R. A. (1984). Tin-bearing sulphides from St Michael's Mount and Cligga Head, Cornwall. Mineralogical Magazine, 48, (348), 389-396 pp.

Mineral Data
What's on the rock

Stannoidite

Formula: 
Cu+6Cu2+2(Fe2+,Zn)3Sn2S12
Strunz: 
2.CB.15c
Crystal System: 
Orthorhombic
Hardness: 
4.0
Type Locality: 
Konjo mine, Aida, Mito-cho, Okayama prefecture, Chugoku region, Honshu Island, Japan

Arsenopyrite

Formula: 
FeAsS
Strunz: 
2.EB.20
Crystal System: 
Monoclinic
Hardness: 
5.5 - 6.0

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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