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Blue John
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Steatite
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Blue John
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Steatite
Blue John
Steatite
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Summary
Astrology
Physical Properties
Optical Properties
Benefits
All
Physical Properties
Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
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-
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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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2.20-2.80
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Perfect
-9999
Mg 3Si 4O 10(OH) 2Gemdat.org , Management Team (2012)
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