plagioclase

[ pley-jee-uh-kleys ]

/ ˈpleɪ dʒi əˌkleɪs /

noun

any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces.

Also called soda-lime feldspar.

Origin of plagioclase

First recorded in 1865–70; plagio- + -clase

OTHER WORDS FROM plagioclase

pla·gi·o·clas·tic

[pley-jee-uh-klas-tik], /ˌpleɪ dʒi əˈklæs tɪk/, adjective

Words nearby plagioclase

plagiarism, plagiarize, plagiary, plagio-, plagiocephaly, plagioclase, plagioclimax, plagiohedral, plagiotropic, plagiotropism, plague

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for plagioclase

A dark, compact rock, having a mottled appearance due to grains of plagioclase, and a green color in section.
The Long Labrador Trail|Dillon Wallace
The former consist mainly of plagioclase, leucite and augite, while the latter contain olivine in addition.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5|Various
The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent.
Mount Rainier|Various
On the right hand side part of a plagioclase crystal with inclosures similar to that in the preceding figure.
Etna|G. F. Rodwell

Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 2|Various

British Dictionary definitions for plagioclase

plagioclase

/ (ˈpleɪdʒɪəʊˌkleɪz) /

noun

a series of feldspar minerals consisting of a mixture of sodium and calcium aluminium silicates in triclinic crystalline form: includes albite, oligoclase, and labradorite

Derived forms of plagioclase

plagioclastic (ˌpleɪdʒɪəʊˈklæstɪk), adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for plagioclase

plagioclase

[ plā′jē-ə-klās′ ]

Any of a series of common feldspar minerals, consisting of differing mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to black. It occurs in igneous rocks. The minerals albite, oligoclase, andesine, labradorite, bytownite, and anorthite are all plagioclases. Chemical formula: (Na,Ca)Al(Si,Al)Si2O8.

单词	plagioclase
释义	plagioclase [ pley-jee-uh-kleys ] / ˈpleɪ dʒi əˌkleɪs / noun any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces. Also called soda-lime feldspar. Origin of plagioclase First recorded in 1865–70; plagio- + -clase OTHER WORDS FROM plagioclase pla·gi·o·clas·tic [pley-jee-uh-klas-tik], /ˌpleɪ dʒi əˈklæs tɪk/, adjective Words nearby plagioclase plagiarism, plagiarize, plagiary, plagio-, plagiocephaly, plagioclase, plagioclimax, plagiohedral, plagiotropic, plagiotropism, plague Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for plagioclase A dark, compact rock, having a mottled appearance due to grains of plagioclase, and a green color in section. The Long Labrador Trail\|Dillon Wallace The former consist mainly of plagioclase, leucite and augite, while the latter contain olivine in addition. Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5\|Various The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent. Mount Rainier\|Various On the right hand side part of a plagioclase crystal with inclosures similar to that in the preceding figure. Etna\|G. F. Rodwell Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase. Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 2\|Various British Dictionary definitions for plagioclase plagioclase / (ˈpleɪdʒɪəʊˌkleɪz) / noun a series of feldspar minerals consisting of a mixture of sodium and calcium aluminium silicates in triclinic crystalline form: includes albite, oligoclase, and labradorite Derived forms of plagioclase plagioclastic (ˌpleɪdʒɪəʊˈklæstɪk), adjective Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for plagioclase plagioclase [ plā′jē-ə-klās′ ] Any of a series of common feldspar minerals, consisting of differing mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to black. It occurs in igneous rocks. The minerals albite, oligoclase, andesine, labradorite, bytownite, and anorthite are all plagioclases. Chemical formula: (Na,Ca)Al(Si,Al)Si2O8. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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