Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
5.9-6.33.355-3.433
1
7.18
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Fracture
Conchoidal, Uneven
Uneven
Cleavage
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
{???} Good, {???} Good
Mohs Hardness
4.5-5-9999
2
10
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Chemical Composition
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)