Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.14-3.165.9-6.3
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven
Cleavage
Perfect on {010} and {110}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
5-5.54.5-5
2
10
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Chemical Composition
MgF 2Ulrich Henn and Claudio C.
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references