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Common Opal
Chrome-Chalcedony
Chrome-Chalcedony and Common Opal Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
1.98-2.50  
2.55-2.70  
Fracture
Conchoidal  
-  
Cleavage
None  
None  
Mohs Hardness
5.5-6.5  
6.5-7  
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)  
SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)  
Optical Properties >>
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Blue Gemstones

Blue Gemstones

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