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Feldspar   /fˈɛldspˌɑr/   Listen
noun
Feldspath, Feldspar  n.  (Min.) 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.





Collaborative International Dictionary of English 0.48


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"Feldspar" Quotes from Famous Books



... years ago the natives were thrown into a state of the greatest excitement by the discovery of valuable deposits of feldspar on one of their rocky farms. The news spread quickly along the river, and the presence of capitalists in their midst lent additional interest to the prospective bonanza. The fishing business again ...
— The New England Magazine Volume 1, No. 3, March, 1886 - Bay State Monthly Volume 4, No. 3, March, 1886 • Various
... iron ore, phosphates, feldspar, bauxite, uranium, and gold; cement; basic metal products; fish processing; food processing, brewing, tobacco products, ...
— The 2007 CIA World Factbook • United States
... this festival of light began sensibly and visibly to decrease, and soon almost ceased. The sides of the gallery assumed a crystallized tint, with a somber hue; white mica began to commingle more freely with feldspar and quartz, to form what may be called the true rock—the stone which is hard above all, that supports, without being crushed, the four stories of ...
— A Journey to the Centre of the Earth • Jules Verne
... varying character; they consist of black, brown, and grey, compact, basaltic bases, with numerous crystals of augite, hornblende, olivine, mica, and sometimes glassy feldspar. A common variety is almost entirely composed of crystals of augite with olivine. Mica, it is known, seldom occurs where augite abounds; nor probably does the present case offer a real exception, for the mica (at least in my best characterised specimen, in which one nodule of this ...
— Volcanic Islands • Charles Darwin
... a hundred and sixty cubic feet of wood. The leaves and the mosses are a substitute, not only for manure, but for ploughing. The carbonic acid given out by decaying leaves, when taken up by water, serves to dissolve the mineral constituents of the soil, and is particularly active in disintegrating feldspar and the clay derived from its decomposition. ... The leaves belong to the soil. Without them it cannot preserve its fertility, and cannot furnish nutriment to the beech. The trees languish, produce seed incapable of germination, and the spontaneous self-sowing, ...
— The Earth as Modified by Human Action • George P. Marsh


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