Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.92.9-3.5
1
7.18
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Fracture
Fibrous
Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
25.5-6
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)