Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.98-4.042.98-3.03
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
Imperfect, poor one {100}
[110] perfect; [010] distinct
Mohs Hardness
4.5-55-6
2
10
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Chemical Composition
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.