Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-3.034.95-5.0
1
7.18
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Fracture
Uneven
Uneven
Cleavage
[110] perfect; [010] distinct
Imperfect to indistinct on {10 1 0}, parting on {0001}
Mohs Hardness
5-64-5
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
(Ce,La)(CO 3)FMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references