Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.95-3.073.16-3.23
1
7.18
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Fracture
Conchoidal
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
[0001] indistinct, [1010] indistinct
Mohs Hardness
5-65
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references