Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.9-6.32.50
1
7.18
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Fracture
Conchoidal, Uneven
Uneven, Conchoidal
Cleavage
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Distinct on {100} and {110}
Mohs Hardness
4.5-55.5-6
2
10
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Chemical Composition
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
3NaAlSi 3O 8 · NaClAnthony et al , Handbook of mineralogy (2001)