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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun feldspar has 1 sense
- feldspar(n = noun.substance) felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium; has particulars: orthoclase, oligoclase, plagioclase, moonstone
is a kind of spar
CIDE DICTIONARY
feldspar, n. [G. feldspath; feld field + spath spar.].
A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish. [1913 Webster]
" The group includes the monoclinic (orthoclastic) species orthoclase or common potash feldspar, and the rare hyalophane or baryta feldspar; also the triclinic species (called in general plagioclase) microcline, like orthoclase a potash feldspar; anorthite or lime feldspar; albite or soda feldspar; also intermediate between the last two species, labradorite, andesine, oligoclase, containing both lime and soda in varying amounts. The feldspars are essential constituents of nearly all crystalline rocks, as granite, gneiss, mica, slate, most kinds of basalt and trachyte, etc. The decomposition of feldspar has yielded a large part of the clay of the soil, also the mineral kaolin, an essential material in the making of fine pottery. Common feldspar is itself largely used for the same purpose."
OXFORD DICTIONARY
feldspar, n. (also felspar) Mineral. any of a group of aluminium silicates of potassium, sodium, or calcium, which are the most abundant minerals in the earth's crust.
Derivative
feldspathic adj. feldspathoid n.
Etymology
G Feldspat, -spath f. Feld FIELD + Spat, Spath SPAR(3): felspar by false assoc. with G Fels rock
See related words and definitions of word "feldspar" in Indonesian