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Guyanaite & Eskolaite

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SKY661355

Guyanaite & Eskolaite

Type Locality

Description Tabs

Description
Locality: 
Merume River, Kamakusa, Potaro-Siparuni Region, Guyana
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.2 × 0.7 × 0.7 cm
Description

Brown crystal aggregates of the very rare chromium mineral guyanaite (seen in the first photo) on a matrix of black eskolaite from the type locality for guyanaite.

Two rare Cr minerals in a single specimen !

Mineral Data
What's on the rock

Guyanaite

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

Eskolaite

Formula: 
Cr2O3
Strunz: 
4.CB.05
Crystal System: 
Trigonal
Hardness: 
8.0 - 8.5
Colour: 
Black
Streak: 
Green
Type Locality: 
Outokumpu Cu-Co-Zn-Ni-Ag-Au ore field, Eastern Finland Region, Finland

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