Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.2-2.63.30-3.50
1
7.18
👆🏻
Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
None
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
3-45
2
10
👆🏻
Chemical Composition
(Fe+++,Al)25(PO4)17O6(OH)12•75(H2O)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references