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
Conchoidal, Brittle, Conchoidal
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
1.6 Cleavage
Good on [110] and on [001]
Distinct on {11 2 0}, imperfect on {10 1 1}
1.7 Mohs Hardness
1.8 Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references