noun
- A hard, crystalline mineral composed of aluminum silicates with potassium, sodium, or calcium; a major constituent of igneous rocks.
Usage: Also spelled feldspar (more common modern spelling).; Technical/geological term.
Examples
- Granite contains large crystals of felspar, quartz, and mica.
- The geologist identified felspar as the dominant mineral in the rock sample.
- Felspar breaks down over time to form clay minerals.
- The white streaks in the stone are composed of felspar crystals.
- Potassium felspar is commonly found in granitic rocks.