Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.813.32-3.43
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Poor on {110} and {100} very poor on {001}
Mohs Hardness
8.56-7
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4