1 Physical Properties
1.1 Tenacity
1.2 Solubility
Gelatinises in acids
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal, Brittle
Uneven, Gemstones (2009), Splintery
1.6 Cleavage
Distinct on {110}
Perfect on {100} and {001}
1.7 Mohs Hardness
1.8 Chemical Composition
(Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.