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Precious Opal
Brucite
Brucite and Precious Opal Physical Properties


Physical Properties
Tenacity
-  
Sectile  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
1.98-2.25  
2.39  
Fracture
Conchoidal  
Irregular  
Cleavage
None  
Perfect on {0001}  
Mohs Hardness
5-6.5  
2.5  
Chemical Composition
SiO 2 · nH 2OGemdat.org , Management Team (2012)  
Mg(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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