Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.444.28-4.42
1
7.18
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Fracture
-
Conchoidal
Cleavage
None Observed
Distinct on [010] and [100] poor on [101]
Mohs Hardness
6.5-75-5.5
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
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)