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Staurolite

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PDM631436

Staurolite

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Description
Locality: 
Puerto de La Hiruela, La Hiruela, Madrid, Spain
Class: 
Single Crystal
Size Range: 
Miniature (4.5-7 cm)
Size: 
5.9 × 2.4 × 1.3 cm
Description

Black prismatic crystal of staurolite of good size, complete and undamaged.

Self-collected near the top of the La Hiruela mountain (Puerto de la Hiruela) in October 1997. 

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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