1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal to uneven, Brittle, Metallic, Uneven, ConchoidalWalter Schumann, Brittle, Metallic
Brittle, Metallic
1.6 Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
Imperfect in one direction
1.7 Mohs Hardness
1.8 Chemical Composition
BeAl 2 O 4
CaCuAlSi 2O 6(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)