Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.362.30-2.40
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Uneven, Conchoidal
Cleavage
[110] perfect, [101] good, [010] distinct
{110} Perfect
Mohs Hardness
3.5-4-9999
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 8Al 6Si 6O 24(SO 4) · H 2OAnthony et al , Handbook of Mineralogy (2001)