Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.93.83-3.89
1
7.18
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Fracture
Fibrous
Uneven, Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
Perfect on {01 1 1}
Mohs Hardness
23.5-4.5
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
Fe2+ CO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references