Tenacity
-
Brittle
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.362.7-3.3
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Uneven, Even
Cleavage
[110] perfect, [101] good, [010] distinct
Perfect on the {001}
Mohs Hardness
3.5-42.5-3.0
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
K(Mg,Fe++)3[AlSi3O10(OH,F)2