Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.755.9-6.3
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
Imperfect on {110}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
5.54.5-5
2
10
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Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references