Lexic.us

Definition of Feldspar

1. Noun. Any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium.

Definition of Feldspar

1. n. 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.

Definition of Feldspar

1. Noun. (minerology) Any of a large group of rock-forming minerals that, together, make up about 60% of the earth's outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks. ¹

¹ Source: wiktionary.com

Definition of Feldspar

1. a mineral [n -S]

Lexicographical Neighbors of Feldspar

Literary usage of Feldspar

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Mineral Industry by Richard Pennefather Rothwell (1922)
"In New Hampshire, a new feldspar-mining industry has been established in connection with the Keene Mica Products Co. at Alstead near Keene, NH At the mica ..."

2. The Principles of Economic Geology by William Harvey Emmons (1918)
"The feldspar utilized in the arts is obtained exclusively from pegmatite veins and ... Much of the feldspar marketed contains 10 to 20 per cent, of quartz. ..."

3. The Principles of Economic Geology by William Harvey Emmons (1918)
"The feldspar utilized in the arts is obtained exclusively from pegmatite veins and ... Potash, soda, and lime feldspars are utilized. Much of the feldspar ..."

4. Biennial report by North Dakota Geological Survey (1906)
"feldspar, which is a silicate of alumina with potash, or with soda or lime, ... feldspar has at ordinary and low temperatures the same effect as sand, ..."

5. Geology of New Jersey by New Jersey Geological Survey, George Hammell Cook (1868)
"One, a granitoid mass of coarsely crystalline feldspar and quartz, with scal"s of graphite. This is firm and solid. One, hornblende and feldspar in small ..."

6. The Journal of Geology by University of Chicago Department of Geology and Paleontology (1904)
"QUARTZ-feldspar-PORPHYRY ... for petrographical study is a gray porphyry with abundant phenocrysts of red feldspar and blue quartz, the matrix or groundmass ..."

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