Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.7-3.92.36
1
7.18
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Fracture
Conchoidal
Uneven, Subconchoidal, Fibrous
Cleavage
{001} perfect; {111} imperfect, may exhibit parting on , {011}
[110] perfect, [101] good, [010] distinct
Mohs Hardness
5.5-63.5-4
2
10
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Chemical Composition
MgOMichael OâDonoghue , Gems, Sixth Edition (2006)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references