Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.20-3.325.9-6.3
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
Poor
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,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references