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Apophyllite
Forsterite
Forsterite and Apophyllite Physical Properties


Physical Properties
Tenacity
-  
-  
Solubility
-  
-  
Durability
-  
-  
Specific Gravity
2.30-2.50  
3.23-3.26  
Fracture
Uneven  
Conchoidal  
Cleavage
Perfect on (001)  
Perfect on {010} imperfect on {100}  
Mohs Hardness
4.5-5  
6.5-7  
Chemical Composition
KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.  
Mg 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)  
Optical Properties >>
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