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Feldspath   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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"Feldspath" Quotes from Famous Books



... justice, they afterwards found it would almost have been impossible for the camels to have gone the way they wished. After passing the base of some high sand-hills, they came to a strong pass, of gentle descent, covered with loose fragments of quartz rock, a yellowish feldspar, and iron ore, very similar to the rocks in the Sebah district. From this place the town opened to their view, erected on a hill about three hundred feet high, standing in the middle of the valley, and has the appearance, at a distance, of a hill studded over with basaltic ...
— Lander's Travels - The Travels of Richard Lander into the Interior of Africa • Robert Huish

... religious, in its regard for the past; so that the Oblong Meeting House, cradle of the community, and for over a century its home and house of government, is chief in the affections of all. In the summer of 1904 this place was marked for all time by the placing there of a boulder of white feldspar, bearing a bronze tablet inscribed with the important facts of the history ...
— Quaker Hill - A Sociological Study • Warren H. Wilson

... obtained in the United States for munition purposes from the burning of seaweed on the Pacific Coast, from the brines in a lake in Southern California and from a rock called alunite in Utah. Potash is also obtainable from feldspar, but I do not know whether any plant has been established for its production from this rock. I recently heard of the arrival of some potash from a newly discovered field in Brazil, and there have been rumours of its discovery in Spain. I do not know how good this Spanish ...
— My Four Years in Germany • James W. Gerard

... leaving the E. and N.E. sides only, towards the gulf of Akaba, more open to the view. On both sides of the wood of Tarfa trees extends a range of low hills of a substance called by the Arabs Tafal [Arabic], which I believe to be principally a detritus of the feldspar of granite, but which, at first sight, has all the appearance of pipe-clay; it is brittle, crumbles easily between the fingers, and leaves upon them its colour, which is a pale yellow. The Arabs sell ...
— Travels in Syria and the Holy Land • John Burckhardt

... face was disturbed by a grin as he listened to the old science-crazed ancient disbursing information regarding the formation of the rock. It troubled me little at that moment whether feldspar and augite were the two largest components, and I knew that Holman and the two girls were not interested. We knew that the place was ugly and sinister, but feldspar and augite ...
— The White Waterfall • James Francis Dwyer

... other countries. The specimens of stone which I brought from the hills in the neighbourhood of Bencoolen were pronounced by some mineralogists, to whom I showed them at the time, to be granite; but upon more particular examination they appear to be a species of trap, consisting principally of feldspar and hornblende, of a greyish colour and nearly similar to the mountain stone ...
— The History of Sumatra - Containing An Account Of The Government, Laws, Customs And - Manners Of The Native Inhabitants • William Marsden

... Egyptians placed in so great a number in their tombs. In spite of their imperfections, the fellahs have been perfectly successful in deceiving most of the travelers, generally grossly ignorant of antiquities. Hard stones, such as basalt, green jasper, burnt serpentine, green feldspar, chalcedony, cornelian, etc., upon which the rude tools of the fellahs would not have worked, would have become, for the amateurs in antiquities, the only pieces of authentic origin; but the Jews of Cairo, also ...
— Scarabs • Isaac Myer

... buckskin wrap without girdle, embroidered at the lower end with multi-coloured porcupine-quills. Bracelets of white shells, a necklace of feldspar crystals and turquoises, and strings of yellow cotton threads around her ankles complete the costume. Such is the woman who has played and still plays an ominous part in the history of Okoya's mother, and in the history of the people at ...
— The Delight Makers • Adolf Bandelier



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