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Naumannite Native Selenium Penroseite

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JYJ756728

Naumannite Native Selenium Penroseite

EDS conf. specimen no 19-11-25-29-Pa

Description Tabs

Description
Locality: 
Virgen de Surumi Mine, Pakajake Canyon, Chayanta Province, Potosi Department, Bolivia
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
1.3 × 1 × 0.7 cm
Description

EDS conf. specimen no 19-11-25-29-Pa hosting greyish large areas of naumannite close to clausthalite. Other minerals are bronze metallic penroseite, minor tiemannite and rarely native selenium. Minor secondary mineralisation (molybdomenite, limonite). 

Analytical data attached! Polished section. 

 

Mineral Data
What's on the rock

Naumannite

Formula: 
Ag2Se
Strunz: 
2.BA.55
Crystal System: 
Orthorhombic
Hardness: 
2.5
Streak: 
black
Type Locality: 
Tilkerode (Abberode), Harz, Saxony-Anhalt, Germany

Selenium

Formula: 
Se
Strunz: 
1.CC.10
Crystal System: 
Trigonal
Hardness: 
2.0
Streak: 
red

Penroseite

Formula: 
(Ni,Co,Cu)Se2
Strunz: 
2.EB.05a
Hardness: 
2.5 - 3.0
Type Locality: 
Virgen de Surumi mine (Pacajake mine; Pakajake mine), Pakajake Canyon (Pacajake Canyon), Chayanta Province, Potosí Department, Bolivia
Analysis
Analysis Report - only: Naumannite Native Selenium Penroseite
Analysis Report - only: Naumannite Native Selenium Penroseite
Analysis Report - only: Naumannite Native Selenium Penroseite
Analysis Report - only: Naumannite Native Selenium Penroseite