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Staurolite
Mineral Data
Fe
2+
2
Al
9
O
6
(SiO
4
)
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