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Brunogeierite

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SKY568879

Brunogeierite

Type Locality

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 0.8 × 0.6 cm
Description

Outstanding specimen of the extremely rare germanium mineral brunogeierite from the type locality. Brunogeierite occurs as sharp black cubic crystals covering an important part of the specimen.

This specimen is exceptional since some of the crystals are very aerial.

Brunogeierite is one of the most sought after species from Tsumeb and certainly is very rarely seen in the systematic mineral market. It was labeled as RRR in Gebhard Tsumeb book (extremely rare, single occurrence with less than 10 specimens known).

Analyzed specimen by SEM-EDS, see photo SEM attached.

Mineral Data
What's on the rock

Brunogeierite

Formula: 
Fe2+2Ge4+O4
Strunz: 
9.AC.15
Crystal System: 
Isometric
Hardness: 
5.0
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

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