Tenacity
Brittle
Brittle
Solubility
Soluble
-
Durability
-
-
Specific Gravity
3.10-3.205.9-6.3
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
Poor to good on (001)
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
6-6.54.5-5
2
10
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Chemical Composition
(Mg,Fe) 5(SiO 4) 2(F,OH) 2Ulrich Henn and Claudio C.
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references