1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.50-3.602.79-2.87
1
7.18
1.5 Fracture
Uneven, Brittle, Metallic, Brittle, Metallic, Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references