Tenacity
-
-
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.773.85-3.94
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
Perfect on {10 1 0}
{010} Good, {100} Distinct
Mohs Hardness
2-2.55-5.5
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
(Mn2+ ,Fe2+ ,Mg,Ca) 2(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth Edition (2006)