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Eskolaite

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SKY674788

Eskolaite

Rare Mineral

Description Tabs

Description
Locality: 
Clear Creek Claim, Goat Mountain, New Idria, San Benito County, California, United States of America
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.3 × 2 × 1.5 cm
Description

Blackish brown crystals of the rare chromium mineral eskolaite ( a mineral of simple cremistry, Cr2O3)  replacing cubic crystals of magnesiochromite, and both associated to cinnabar, from this locality famous for its mercury minerals.

 

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

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