Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.775.85-6.15
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Perfect [001] good [010] poor [110]
Fair in four directions forming octahedrons
Mohs Hardness
6-6.53.5-4
2
10
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Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Cu 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references