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
ConchoidalWalter Schumann, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
Uneven
1.6 Cleavage
Perfect on {010}, good on {100}
{110} Good
1.7 Mohs Hardness
1.8 Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
(Fe2+ ,Mg)Al 2(PO 4) 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)