Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.96.5-7.1
1
7.18
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Fracture
Fibrous
Uneven, Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
Imperfect- [10 1 1]
Mohs Hardness
23.5-4
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)