Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.9-6.32.72-2.83
1
7.18
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Fracture
Conchoidal, Uneven
Uneven
Cleavage
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Good on {100} and {110}
Mohs Hardness
4.5-56-7
2
10
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Chemical Composition
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 2(Ti,Fe)Si 4(O,F) 11Ulrich Henn and Claudio C.