Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.942.98-3.03
1
7.18
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Fracture
Conchoidal, Uneven
Uneven
Cleavage
{010} Good, {100} Distinct
[110] perfect; [010] distinct
Mohs Hardness
5-5.55-6
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.