Tenacity
-
Brittle
Solubility
insoluble
Soluble
Durability
-
-
Specific Gravity
2.363.25-3.35
1
7.18
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Fracture
Uneven, Subconchoidal, Fibrous
Conchoidal, ConchoidalWalter Schumann
Cleavage
[110] perfect, [101] good, [010] distinct
Perfect in three directions
Mohs Hardness
3.5-45
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
CuSiO 2(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references