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Forsterite
Rubellite
Rubellite and Forsterite Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
3.23-3.26  
3.01-3.06  
Fracture
Conchoidal  
Conchoidal  
Cleavage
Perfect on {010} imperfect on {100}  
Indiscernible  
Mohs Hardness
6.5-7  
7-7.5  
Chemical Composition
Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)  
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.  
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