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Boulder Opal
Blue John
Blue John and Boulder Opal Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
1.98-2.25  
3.00-3.25  
Fracture
Conchoidal  
-  
Cleavage
None  
Perfect  
Mohs Hardness
5-6.5  
-9999  
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.  
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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Compare Blue Gemstones

Blue Gemstones

Blue Gemstones

Compare Blue Gemstones

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