Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.32-4.482.50-2.80
1
7.18
👆🏻
Fracture
Uneven, Subconchoidal, Conchoidal
-
Cleavage
{101}, good; {010}, poor
Perfect
Mohs Hardness
3.55-6.5
2
10
👆🏻
Chemical Composition
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)