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Blue John
Blue John

Steatite
Steatite



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Blue John
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Steatite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
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-
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2.20-2.80
-
Perfect
-9999
Mg 3Si 4O 10(OH) 2Gemdat.org , Management Team (2012)