S T A U R O L I T E
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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. |