1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.69-2.722.79-2.87
1
7.18
1.5 Fracture
Uneven, Conchoidal, Gems, Sixth Edition (2006)
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
(Na,Ca)1-2Si3-2O8
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references