Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.65-2.903.85-3.94
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
{001} Perfect
{010} Good, {100} Distinct
Mohs Hardness
-99995-5.5
2
10
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Chemical Composition
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)