Tenacity
-
Brittle
Solubility
Partially soluble in water
-
Durability
-
-
Specific Gravity
1.775.6-5.76
1
7.18
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Fracture
-
Uneven
Cleavage
Perfect on {10 1 0}
[001] perfect; [100] distinct
Mohs Hardness
2-2.52.5-3
2
10
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Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)