1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.4 Fracture
Uneven
Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle
2.5 Cleavage
{100} Perfect, {010} Perfect
Imperfect on {110}
2.6 Mohs Hardness
3.10 Chemical Composition
(Fe,Mg) 2Si 2O 6Ulrich Henn and Claudio C.
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.