Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.3923.98-4.04
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
{010} moderate, {100} imperfect
Imperfect, poor one {100}
Mohs Hardness
6.5-74.5-5
2
10
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Chemical Composition
Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references