Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.33.69-3.81
1
7.18
👆🏻
Fracture
Lamellar
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Cleavage
Perfect 001
Distinct on {110}, imperfect on {010}, poor on {001}
Mohs Hardness
2-2.58.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
BeAl 2 O 4