Tenacity
-
-
Solubility
insoluble
-
Durability
-
-
Specific Gravity
2.362.90-3.14
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Fibrous
Conchoidal, Uneven
Cleavage
[110] perfect, [101] good, [010] distinct
Imperfect; basal
Mohs Hardness
3.5-47.5-8
2
10
👆🏻
Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.