Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.71-2.725.00-5.30
1
7.18
👆🏻
Fracture
Fibrous
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{???} Good
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
6-6.56
2
10
👆🏻
Chemical Composition
Ca 6Si 6O 17(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Fe 2O 3Arthur Thomas , Gemstones (2009)