1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, Brittle, Conchoidal
Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle
1.6 Cleavage
Good on [110] and on [001]
Imperfect, poor one {100}
1.7 Mohs Hardness
2.5 Chemical Composition
[ ]Na2(Mg3Al2)Si8O22(OH)2
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references