Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.945.2
1
7.18
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Fracture
Conchoidal, Uneven
Subconchoidal, Conchoidal
Cleavage
{010} Good, {100} Distinct
Good in one direction
Mohs Hardness
5-5.56-6.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
(Fe,Mn)Ta 2O 6Walter Schumann , Gemstones of the world (2001) More from other references