Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.55-3.732.90-2.98
1
7.18
👆🏻
Fracture
Conchoidal, Uneven
Conchoidal, ConchoidalWalter Schumann
Cleavage
none
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
7-7.57.5-8
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references