Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.0-3.13.85-3.94
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
Perfect on {001}
{010} Good, {100} Distinct
Mohs Hardness
3.55-5.5
2
10
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Chemical Composition
Ca(Mg,Al)3(Al3Si)O10(OH)2
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)