Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.362.51-2.63
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Conchoidal
Cleavage
[110] perfect, [101] good, [010] distinct
Perfect
Mohs Hardness
3.5-44
2
10
👆🏻
Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)