Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.98-4.043.1-3.5
1
7.18
👆🏻
Fracture
Conchoidal
Granular
Cleavage
Imperfect, poor one {100}
None
Mohs Hardness
4.5-55-6
2
10
👆🏻
Chemical Composition
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)