question: What are the two most common silicates?
distractor3: Micas	 and quartz
distractor1: Olivine and quartz
distractor2: Micas	 and feldspar
correct_answer: feldspar and quartz
support: 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 .