Tenacity
-
Very brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.85-3.943.30-3.40
1
7.18
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Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
{010} Good, {100} Distinct
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
5-5.56.5-7
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references