1. Feldspar: This is the most abundant mineral in the Earth's crust, making up about 60% of its composition. It's a group of minerals with a complex chemical formula, but essentially, they are composed of silicon, oxygen, aluminum, and either potassium, sodium, or calcium.
2. Quartz: This is the second most abundant mineral, making up about 12% of the crust. It's a simple mineral with a chemical formula of SiO2 (silicon dioxide).
Together, these two minerals make up a significant majority of the Earth's crust!
