Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.6-3.34.32-4.48
1
7.18
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Fracture
Lamellar
Uneven, Subconchoidal, Conchoidal
Cleavage
Perfect 001
{101}, good; {010}, poor
Mohs Hardness
2-2.53.5
2
10
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Chemical Composition
(Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6
Zn 2(AsO 4)(OH)Michael OâDonoghue , Gems, Sixth edition (2006)