Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.812.95-3.07
1
7.18
👆🏻
Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Mohs Hardness
8.55-6
2
10
👆🏻
Chemical Composition
BeAl 2 O 4
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.