1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal, Gems, Sixth Edition (2006)
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
1.6 Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
Perfect on {100}, imperfect on {001}
1.7 Mohs Hardness
1.8 Chemical Composition
(Na,Ca)1-2Si3-2O8
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)