1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Uneven, Gems, Sixth Edition (2006), Uneven, Conchoidal
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
1.6 Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
Imperfect on {110}
1.7 Mohs Hardness
1.8 Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.