noun
- a group of rock-forming minerals that are the most abundant minerals in the Earth’s crust, composed mainly of aluminum silicates with sodium, potassium, or calcium
Usage: geology
Examples
- Granite contains large crystals of feldspar, quartz, and mica.
- The pink color in granite comes from potassium feldspar.
- Feldspar is used in the manufacture of glass and ceramics.
- Plagioclase feldspar is common in igneous rocks.
- The geologist identified feldspar crystals in the rock sample.
- Weathering of feldspar produces clay minerals.
- Orthoclase is a type of feldspar found in many rocks.