Tenacity
-
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.363.50-3.60
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Uneven
Cleavage
[110] perfect, [101] good, [010] distinct
Good on {110}, (110) ^ (1 1 0) ≈87°; parting on {100}
Mohs Hardness
3.5-46
2
10
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Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Na,Fe,Ca)Si 2O 6Ulrich Henn and Claudio C.