Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.9
1
7.18
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Fracture
Uneven, Conchoidal
Fibrous
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
[010] Perfect, [100] Distinct, [011] Distinct
Mohs Hardness
6-6.52
2
10
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Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite