Click for expanded view
Hardness: 7 - 7.5
Density: 3.7 - 3.8
Habit: Crystalline, often twinned
Colours: Dark brown
| ||Crystal System: Monoclinic|
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.