Explanation:

- Feldspar is the most abundant mineral group in the Earth's continental crust. These silicate minerals make up about 60% of the crust's composition. They are divided mainly into two types: plagioclase and alkali feldspar.

- Quartz is the second most abundant mineral in the continental crust. It is a key component of many rock types, particularly granite, but its abundance is less than that of feldspar.

- Micas are sheet silicates and are not as abundant as feldspar or quartz. They include minerals like biotite and muscovite, which are common in granitic and metamorphic rocks.

- Pyroxenes are important in the oceanic crust and upper mantle, but they are not as prevalent in the continental crust as feldspar or quartz.

Correct Answer: Feldspar