1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.2 Durability
Not Available
Not Available
1.5 Specific Gravity
1.15 Fracture
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Subconchoidal, Conchoidal, Brittle
1.16 Cleavage
Imperfect on {110}
Fair on {100}, poor on {001} and {010}
1.17 Mohs Hardness
1.18 Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
Mg2Al4Si5O18