1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.98-2.502.79-2.87
1
7.18
1.5 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Not Available
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references