Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.2-2.62.36
1
7.18
👆🏻
Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
None
[110] perfect, [101] good, [010] distinct
Mohs Hardness
3-43.5-4
2
10
👆🏻
Chemical Composition
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references