Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.92.65-2.90
1
7.18
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Fracture
Fibrous
-
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
{001} Perfect
Mohs Hardness
2-9999
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references