Mineral 1.0Test your knowledge of specific minerals

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StauroliteFe2Al9O6(SiO4)4(O,OH)2

Class: Silicate
Hardness: 7 - 7.5
Density: 3.7 - 3.8
Streak: Gray
Lustre: Vitreous
Habit: Crystalline, often twinned
Colours: Dark brown

  Crystal System: Monoclinic
Cleavage: Distinct
Fracture: Subconchoidal
Magnetism: None
Reaction with HCl: Unknown

Identification in hand sample:
The "staurolite cross" and colour are indicative.

Industrial / ecomonic uses:
Used as an abrasive due to its high hardness.

  

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