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Elbaite
Boulder Opal
Boulder Opal and Elbaite Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
2.90-3.10  
1.98-2.25  
Fracture
Uneven, Conchoidal  
Conchoidal  
Cleavage
Poor/indistinct on {1120} and {1011}  
None  
Mohs Hardness
7  
5-6.5  
Chemical Composition
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references  
SiO 2 + H 2OUlrich Henn and Claudio C.  
Optical Properties >>
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