Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.69-3.81
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect {10 1 0}
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
5.5-68.5
2
10
👆🏻
Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
BeAl 2 O 4