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Adamite & Naumannite

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JYJ776471

Adamite & Naumannite

20-04-04-tsu37 EDS & XRD confirmed

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.8 × 2.8 × 2.8 cm
Description

XRD & EDS confirmed colourless adamite on chalcocite & naumannite matrix. This is the first record of naumannite from Tsumeb. Naumannite is intergrown with chalcocite. Minor superposition of chalcocite in the EDS data with naumannite (Ag/Se ~ 2:1)

This is also an unusual crystal habit for adamite. Analysis attached. 

 

Mineral Data
What's on the rock

Adamite

Formula: 
Zn2(AsO4)(OH)
Strunz: 
8.BB.30
Crystal System: 
Orthorhombic
Hardness: 
3.5
Streak: 
white
Type Locality: 
Chañarcillo, Copiapó Province, Atacama Region, Chile

Naumannite

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