FELDSPAR
- a family of crystalline minerals, also FELSPAR [n -S]
- any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks
- a mineral (a naturally occurring inorganic substance having a characteristic set of physical properties) [n FELDSPARS]
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