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Staurolite

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PDM733501

Staurolite

Classic Locality

Description Tabs

Description
Locality: 
Miné Kerrest Quarry, Lopérec, Finistère, Brittany, France
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
5 × 4 × 1.2 cm
Largest Crystal: 
2.60cm
Description

Brown staurolite crystals with a cruciform twin which the two individuals cross at 90° (Brittany twin). Complete and undamaged.

Ex. Dr. Bob Janssens specimen, #955. Acquired in 2002.

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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