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Crookesite & Clausthalite

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SKY704479

Crookesite & Clausthalite

Rare Mineral

Description Tabs

Description
Locality: 
Skrikerum Mine, Valdemarsvik, Östergötland County, Sweden
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1 × 0.8 × 0.7 cm
Description

Metallic crystals and crusts of the extremely rare crookesite, a copper-thallium-silver selenide, a mineral full of rare elements; in fact it's the only mineral frokm more 5400 that contains Ag, Tl and Se at the same time !.

Associated mineral in the specimen is metallic minoritary clausthalite. Matrix is calcite. Type locality mineral.

Mineral Data
What's on the rock

Crookesite

Formula: 
Cu7(Tl, Ag)Se4
Strunz: 
2.BD.50
Crystal System: 
Tetragonal
Hardness: 
2.5 - 3.0
Colour: 
Lead Grey
Type Locality: 
Skrikerum Mine (Skrickerum Mine), Valdemarsvik, Östergötland, Sweden

Clausthalite

Formula: 
PbSe
Strunz: 
2.CD.10
Hardness: 
2.5 - 3.0
Type Locality: 
St Lorenz Mine, Burgstatt veins, Clausthal-Zellerfeld, Harz, Lower Saxony, Germany

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