Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.14-3.162.55-2.65
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Perfect on {010} and {110}
Perfect {10 1 0}
Mohs Hardness
5-5.55.5-6
2
10
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Chemical Composition
MgF 2Ulrich Henn and Claudio C.
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)