Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.95-3.076.86-7.03
1
7.18
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Fracture
Conchoidal
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
5-66-7
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references