Final answer:
The two most common silicate groups are the feldspars and the amphiboles.
Step-by-step explanation:
The two most common silicate groups are the **feldspars** and the **amphiboles**.
Feldspars are a group of rock-forming minerals that make up about 60% of the Earth's crust. They are important in the formation of igneous rocks and are commonly found in granite. Some examples of feldspars include orthoclase, plagioclase, and microcline.
Amphiboles are another group of silicate minerals that are commonly found in metamorphic and igneous rocks. They have a complex structure and include minerals such as hornblende and actinolite.