Tenacity
Brittle
Sectile
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.776.13
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
Perfect [001] good [010] poor [110]
Distinct on {001} and {110}, indistinct on {100}
Mohs Hardness
6-6.52-3
2
10
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Chemical Composition
CaAl 2Si 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references