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Eucairite Umangite & Berzelianite

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JYJ765463

Eucairite Umangite & Berzelianite

EDS conf. specimen no 19-12-14-BUK

Description Tabs

Description
Locality: 
Bukov Mine, Rožná, Žďár nad Sázavou District, Vysočina Region, Czech Republic
Class: 
Massive/Crystalline
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.5 × 3.4 × 1.4 cm
Description

EDS conf. polished section no 19-12-14-BUK hosting mainly grey eucairite, purple umangite, grey clausthalite and partially native gold. Minor berzelianite is also associated within the calcite. 

Analysis attached. 

 

Mineral Data
What's on the rock

Eucairite

Formula: 
AgCuSe
Strunz: 
2.BA.50
Hardness: 
2.5
Streak: 
Shining
Type Locality: 
Skrikerum Mine (Skrickerum Mine), Valdemarsvik, Östergötland, Sweden

Umangite

Formula: 
Cu3Se2
Strunz: 
2.BA.25
Crystal System: 
Tetragonal
Hardness: 
3.0
Streak: 
Black
Type Locality: 
Trogtal Quarries, Lautenthal, Harz, Lower Saxony, Germany

Berzelianite

Formula: 
Cu2Se
Strunz: 
2.BA.20
Crystal System: 
Isometric
Hardness: 
2.0
Streak: 
Shining
Type Locality: 
Skrikerum Mine (Skrickerum Mine), Valdemarsvik, Östergötland, Sweden