Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A white to yellowish red monoclinic mineral of the potassium feldspar group that forms from medium- to low-temperature magmas.
from The Century Dictionary.
- noun Common or potash feldspar, a silicate of aluminium and potassium, occurring in monoclinic crystals and also massive.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See
feldspar .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy
Potassium aluminum silicate ,K Al Si 3O 8, a commonfeldspar ofigneous ,plutonic , andmetamorphic rocks . Orthoclase is the main feldspar ofpegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in theceramic andglass industries and as a decorative gravel.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a white or colored monoclinic feldspar
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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It occurs as nitrate in nitre (KNO_ {3}), and as silicate in many minerals, such as orthoclase (or potash-felspar) and muscovite (or potash-mica).
A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
Feldspar 2008
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A pomegranate is not a species of granular crystalline rock consisting essentially of quartz, orthoclase-feldspar, and mica, as I spelled it.
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(K2O · Al2O3 ·6SiO2), exists as minerals named orthoclase and microcline, melting at 1200°C.
13. Glaze oxides 1993
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Those yielded by orthoclase must generally abound in potash, while albite and labradorite, containing little or none of that element, must produce soils in which it is deficient.
Elements of Agricultural Chemistry Thomas Anderson
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(Common orthoclase feldspar, which is frequently of a brownish pink or flesh color, will do.)
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade
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Other kinds of felspar, even orthoclase, may however also show the aventurine appearance.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" Various
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In this way I have melted beryl, orthoclase, and quartz.
Scientific American Supplement, No. 531, March 6, 1886 Various
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There are, for instance, several different minerals commonly classified under the name of felspar, which have been distinguished by mineralogists by the names of orthoclase, albite, oligoclase, and labradorite; and there are at least two sorts of mica, two of hornblende, and many varieties of zeolites.
Elements of Agricultural Chemistry Thomas Anderson
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Granite is a mixture of quartz, felspar, and mica in variable proportions, and the quality of the soil it yields depends on whether the variety of felspar present be orthoclase or albite.
Elements of Agricultural Chemistry Thomas Anderson
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