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Staurolite

Mineral Data
Fe2+2Al9O6(SiO4)4(O,OH)2
Strunz: 
9.AF.30
Physical Properties
Colour: 
Brown
Crystal System: 
‎Monoclinic
Hardness: 
7.0 - 7.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Estaurolita
Photos