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Staurolite

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ESM966512

Staurolite

Description Tabs

Description
Locality: 
Keivy Mountains, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Small cabinet (7-10 cm)
Size: 
8 × 8 × 4 cm
Description

Twinned staurolite crystals (Sait Andrew's cross) on a mica schist

Mineral Data
What's on the rock

Staurolite

Formula: 
Fe2+2Al9O6(SiO4)4(O,OH)2
Strunz: 
9.AF.30
Crystal System: 
‎Monoclinic
Hardness: 
7.0 - 7.5
Colour: 
Brown