Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.95-3.072.36
1
7.18
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Fracture
Conchoidal
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect on {110} at 56° and 124°; partings on {010} and {100}
[110] perfect, [101] good, [010] distinct
Mohs Hardness
5-63.5-4
2
10
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Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references