Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.653.14-3.16
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
Perfect {10 1 0}
Perfect on {010} and {110}
Mohs Hardness
5.5-65-5.5
2
10
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Chemical Composition
(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
MgF 2Ulrich Henn and Claudio C.