noun
- plural of feldspar; a group of rock-forming minerals that are aluminum silicates containing potassium, sodium, or calcium
Usage: geology; mineralogy
Examples
- Feldspars are the most abundant minerals in the Earth’s crust.
- The granite sample contained quartz, mica, and several types of feldspars.
- Potassium feldspars give granite its pink or red color.
- Weathering of feldspars produces clay minerals.
- The geologist identified plagioclase feldspars in the volcanic rock.
- Feldspars are essential components of igneous rocks like granite and basalt.