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Bracewellite & Guyanaite

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SKY747766

Bracewellite & Guyanaite

Type Locality

Description Tabs

Description
Locality: 
Merume River, Kamakusa, Potaro-Siparuni Region, Guyana
Class: 
Massive/Crystalline
Size Range: 
Micromount (under 1cm)
Size: 
0.4 × 0.4 × 0.2 cm
Description

Extremely rare crystal group of black bracewellite from the type and only one of two localities known worldwide, associated to guyanaite and eskolaite

Bracewellite is Chromium oxide-hydroxide.

Mineral Data
What's on the rock

Bracewellite

Formula: 
CrO(OH)
Strunz: 
4.FD.10
Crystal System: 
Orthorhombic
Hardness: 
5.5 - 6.5
Type Locality: 
Merume river, Kamakusa, Mazaruni District, Guyana

Guyanaite

Formula: 
CrO(OH)
Strunz: 
4.FD.10
Hardness: 
0.0
Type Locality: 
Merume river, Kamakusa, Mazaruni District, Guyana

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