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Brannerite & Gold

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ESM617002

Brannerite & Gold

Description Tabs

Description
Locality: 
Witwatersrand, Gauteng Province, South Africa
Class: 
Combination
Size Range: 
Micromount (under 1cm)
Size: 
0.7 × 0.6 × 0.5 cm
Description

Black brannerite with some gold grains

Mineral Data
What's on the rock

Brannerite

Formula: 
(U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6
Strunz: 
4.DH.05
Crystal System: 
Monoclinic - Prismatic
Hardness: 
4.5 - 5.5
Type Locality: 
Kelley Gulch, Stanley, Stanley Basin District, Custer Co., Idaho, USA

Gold

Formula: 
Au
Strunz: 
1.AA.05
Crystal System: 
Isometric
Hardness: 
2.5 - 3.0