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Staurolite

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PDM801405

Staurolite

Description Tabs

Description
Locality: 
Pestsovye Keivy, Keivy Mountains, Murmansk Oblast, Russian Federation
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.5 × 2.3 × 1 cm
Description

Rare specimen of a regular star-like aggregate of three brown staurolite crystals twinned at 60° angles on {231}, forming a cyclic twinned piece.

Acquired in 1995.

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

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