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Eskolaite

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CR660095

Eskolaite

Rare Mineral

Description Tabs

Description
Locality: 
Outokumpu, North Karelia, Finland
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.5 × 1.2 × 0.8 cm
Largest Crystal: 
0.70cm
Description

Eskolaite is a very rare chromium oxide and this specimen is from the Type Locality - Outokumpu, Finland.

A lustrous, 7 mm across, sharp trigonal, black crystal is set on the edge of brassy pyrrhotite matrix.

Classic material from this noted locale with an old label.

Mineral Data
What's on the rock

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