Tenacity
-
Brittle
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.773.98-4.04
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect on {10 1 0}
Imperfect, poor one {100}
Mohs Hardness
2-2.54.5-5
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references