Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.445.35
1
7.18
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Fracture
-
Conchoidal
Cleavage
None Observed
Perfect on {100}, imperfect on {001}
Mohs Hardness
6.5-72.5
2
10
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Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)