Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Feldspar and quartz are the two most common silicates. In beryl, the silicate pyramids join together as rings. Biotite is mica. The silicate pyramids come together to create thin, flexible sheets. Compare the beryl and the biotite pictured below ( Figure below ). Answer: feldspar and quartz
A:
What are the two most common silicates?