Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.363.19-3.56
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Uneven, Conchoidal
Cleavage
[110] perfect, [101] good, [010] distinct
{110} Perfect, {010} Indistinct
Mohs Hardness
3.5-45.5-6
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
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) 2O 6Anthony et al , Handbook of mineralogy (2001)