orthoclase


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Related to orthoclase: biotite, albite, microcline

or·tho·clase

 (ôr′thə-klās′, -klāz′)
n.
A white to yellowish red monoclinic mineral of the potassium feldspar group that forms from medium- to low-temperature magmas.

[Greek ortho-, ortho- + Greek klasis, a breaking (from klān, to break).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

orthoclase

(ˈɔːθəʊˌkleɪs; -ˌkleɪz)
n
(Minerals) a white to pale yellow, red, or green mineral of the feldspar group, found in igneous, sedimentary, and metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: potassium aluminium silicate. Formula: KAlSi3O8. Crystal structure: monoclinic
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

or•tho•clase

(ˈɔr θəˌkleɪs, -ˌkleɪz)

n.
a common white or pink potassium feldspar mineral, KAlSi3O8, having two good cleavages at right angles, and found in silica-rich igneous rocks.
[1840–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

or·tho·clase

(ôr′thə-klās′)
A type of feldspar consisting of potassium aluminum silicate. Orthoclase is typically white, pink, yellow, or brown, but it can also be colorless. It is especially common in igneous rocks.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.orthoclase - a white or colored monoclinic feldsparorthoclase - a white or colored monoclinic feldspar
feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations
References in periodicals archive ?
In the complex microprophries is very fine grained with orthoclase, perthite, quartz, biotite, magnetite, epidote as major minerals.
Non-stable fragments are represented by subangular K-feldspar grains (orthoclase and microcline) with [M.sub.d] 0.20 mm, polysynthetically twinned plagioclase, flakes of muscovite and biotite and subangular to subrounded clasts of lutite.
The analysis showed that the composition of the original ash sample included mainly quartz, lime, anhydrite, calcite and smaller amounts of orthoclase, periclase, gehlenite, larnite, merwinite, pseudowollastonite, hematite, ettringite, melilite and dolomite (Table 2).
Mineral Mohs Relative Scratch Test Vickers kg/ Hardness [mm.sup.2] Talc 1 Easily Scratched by 2.4 Fingernail Gypsum 2 Scratchable by Fingernail 36 Calcium 3 Easly Scratched by Knife 109 Carbonate Fluorite 4 Scratchable by Knife 189 Apatite 5 Difficult to Scratch 536 with Knife Orthoclase 6 Scratches with Steel File 795 Quartz 7 Scratches Window Glass 1,120 Topaz 8 Scratches Quartz 1,427 Corundum 9 Scratches Topaz 2,060 Diamond 10 Glass Cutter 10,060
Ince, "Influence of orthoclase phenocrysts on point load strength of granitic rocks," Engineering Geology, vol.
The diffraction reflections of orthoclase were found at 2[theta] values of 15.4, 21.0, 25.7, 27.5, and 30.1[degrees] (PDF 00-022-1212), whereas the diffraction reflections of muscovite were found at a 2[theta] value of 18.0[degrees] (PDF 00-0582036).
The intraparticle dissolution pores (pore size < 100 [micro] m) were mostly produced by orthoclase dissolution.
Qz: quartz; Ap: Apatite; Cpx: clinopyroxene; Pl: plagioclase; Or: orthoclase; Mag: magnetite; Ilm: ilmetite.
A prediction model was established by using segment wear as the evaluation criterion, and stone properties, including Si[O.sub.2] content, quartz content, orthoclase content, plagioclase content, shore hardness, density, uniaxial compressive strength, and bending strength as input parameters, and FAHP and TOPSIS techniques were employed to evaluate the sawability.
The low concentration of soluble [K.sub.2]O present in the phonolite may be due to the predominance of some constituent minerals such as: microcline (KAI[Si.sub.3][O.sub.8]), orthoclase (KAI[Si.sub.3][O.sub.8]), andesine [(Na,Ca)[(Si,Al).sub.4][O.sub.8]] and e nepheline [(Na, K) AlSi[O.sub.4]] (Teixeira et al., 2012), where K is retained by covalent bonds in the crystalline network of the mineral, presenting low K release to the soil solution (Martins et al., 2008).
The XRD patterns indicate that the sanidine is mixed with other K.-feldspars, such as microclinc and orthoclase. The sand sample from the R8 ash layer (west area) also contained calcite.