Tenacity
Brittle
Slightly sectile
Solubility
-
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
Durability
-
-
Specific Gravity
2.95-3.072
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Prismatic {10 1 0}, perfect
Mohs Hardness
5-62-2.5
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references