Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.85-3.945.05
1
7.18
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Fracture
Conchoidal, Uneven
Uneven
Cleavage
{010} Good, {100} Distinct
[001] perfect
Mohs Hardness
5-5.53-3.5
2
10
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Chemical Composition
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)
Pb 26Ag 10Cu 24Cl 62(OH) 48 · 3H 2OWalter Schumann , Gemstones of the world (2001) More from other references