What are the two most common silicates?
Micas	 and quartz
Olivine and quartz
Micas	 and feldspar
feldspar and quartz
Feldspar and quartz are the two most common silicates. In beryl, the silicate pyramids join together as rings. Biotite is mica. It can be broken apart into thin, flexible sheets. Compare the beryl and the biotite shown in Figure below .