Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.34-2.512.9
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
None
{???} Indistinct
Mohs Hardness
-99994.5
2
10
👆🏻
Chemical Composition
SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)