1. Plural of felspar; a group of hard, crystalline minerals that are the most abundant minerals in the Earth's crust, composed of silicates of aluminum with potassium, sodium, or calcium.
Usage: Also spelled 'feldspars' (more common in modern usage); Technical/geological term; Countable noun when referring to individual crystals or samples; often used as a mass noun in geological contexts

Examples

• Felspars make up about 60% of the Earth's continental crust.
• The granite sample contained large crystals of felspars alongside quartz and mica.
• Geologists identify different types of felspars based on their chemical composition.
• Weathering of felspars in rocks contributes to soil formation.
• The pink felspars in this granite give it its distinctive color.