Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.56-2.753.43-3.44
1
7.18
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Fracture
Uneven, Conchoidal
-
Cleavage
two or three
None Observed
Mohs Hardness
6-6.56.5-7
2
10
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Chemical Composition
KAlSi3O8
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references