Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.83-3.892.9
1
7.18
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Fracture
Uneven, Conchoidal
Fibrous
Cleavage
Perfect on {01 1 1}
[010] Perfect, [100] Distinct, [011] Distinct
Mohs Hardness
3.5-4.52
2
10
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Chemical Composition
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite