Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.08-3.125.00-5.30
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{010} Perfect
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
7.56
2
10
👆🏻
Chemical Composition
BeAlSiO 4(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)