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English-Thai Dictionary

feldspar

N แร่ หิน ภูเขาไฟ felspar rae-hin-pu-kao-fai

Webster's 1828 Dictionary

FELDSPAR, FELSPAR, FELDSPATH, FELSPATH

n.A mineral widely distributed and usually of a foliated structure. When in crystals or crystalline masses, it is very susceptible of mechanical division at natural joints. its hardness is a little inferior to that of quartz. There are several varieties, as common feldspar, the adularia, the siliceous, the glassy, the ice-spar, the opalescent, aventurine feldspar, petuntze, the granular, and the compact.

Webster's 1913 Dictionary

FELDSPAR; FELDSPATH

Feld "spar `, Feld "spath `, n. Etym: [G. feldspath; feld field + spath spar. ] (Min. )

Defn: 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.

Note: 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.

New American Oxford Dictionary

feldspar

feld spar |ˈfel (d )ˌspär ˈfɛldˌspɑr | ▶noun an abundant rock-forming mineral typically occurring as colorless or pale-colored crystals and consisting of aluminosilicates of potassium, sodium, and calcium. ORIGIN mid 18th cent.: alteration of German Feldspat, Feldspath, from Feld ‘field ’ + Spat, Spath ‘spar ’ (see spar 3 ). The form felspar is by mistaken association with German Fels ‘rock. ’

Oxford Dictionary

feldspar

feldspar |ˈfɛldspɑː |(also felspar ) ▶noun [ mass noun ] an abundant rock-forming mineral typically occurring as colourless or pale-coloured crystals and consisting of aluminosilicates of potassium, sodium, and calcium. ORIGIN mid 18th cent.: alteration of German Feldspat, Feldspath, from Feld ‘field ’ + Spat, Spath ‘spar ’ (see spar 3 ). The form felspar is by mistaken association with German Fels ‘rock ’.

Sanseido Wisdom Dictionary

feldspar

feld spar /fél (d )spɑ̀ː r /名詞 U 〘鉱〙長石 .