Definition of feldspar
: any of a group of crystalline minerals that consist of aluminum silicates with either potassium, sodium, calcium, or barium and that are an essential constituent of nearly all crystalline rocks
Recent Examples of feldspar from the Web
A new paper in Nature tries to quantify some of these questions by looking at the age and compositional data recorded in plagioclase feldspar crystals.
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Origin and Etymology of feldspar
modification of obsolete German Feldspath (now Feldspat), from German Feld field + obsolete German Spath (now Spat) spar
First Known Use: 1772See Words from the same year
FELDSPAR Defined for English Language Learners
Definition of feldspar for English Language Learners
: a very common type of mineral
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