Blue John and Dumortierite quartz Physical Properties

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Blue John

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Dumortierite quartz

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Blue John

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Dumortierite quartz

Blue John

Blue John

Dumortierite quartz

Dumortierite quartz

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

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3.00-3.25

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Perfect

-9999

CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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-9999

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-9999

Al7BO3(SiO4)3O3

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Dumortierite quartz

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