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, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal
1.6 Cleavage
Distinct on {11 2 0}, imperfect on {10 1 1}
{???} Indistinct
1.7 Mohs Hardness
1.8 Chemical Composition
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)