Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.102.58-2.80
1
7.18
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Fracture
Uneven
Uneven, Irregular
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Perfect
Mohs Hardness
3.5-45.5
2
10
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Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)