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Krieselite & Pennantite

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JYJ937593

Krieselite & Pennantite

Description Tabs

Description
Locality: 
Tsumeb Mine, Otavi Highlands, Namibia
Class: 
Crystals on Matrix
Size Range: 
Micromount (under 1cm)
Size: 
0.7 × 0.6 × 0.5 cm
Description

Thin tabular green Ga-Ge analogue of pennantite associated with minor krieselite on germanite-renierite matrix. 

 

Mineral Data
What's on the rock

Krieselite

Formula: 
(Al,Ga)2(GeO4)(OH)2
Strunz: 
9.AF.20
Hardness: 
5.5 - 6.5
Streak: 
White
Type Locality: 
Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto Region (Oshikoto), Namibia

Pennantite

Formula: 
Mn2+5Al(AlSi3O10)(OH)8
Strunz: 
9.EC.55
Hardness: 
2.0 - 2.5
Type Locality: 
Benallt Mine (Tyddyn Meirion mine; Ty Canol mine), Rhiw, Llanfaelrhys, Lleyn Peninsula, Gwynedd (Caernarvonshire), Wales, UK