Tenacity
-
-
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.773.07-3.13
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
Perfect on {10 1 0}
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
2-2.53-3.5
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references