plagioclase

plagioclase

(ˈpleɪdʒɪəʊˌkleɪz)

n

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

plagioclastic adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

pla•gi•o•clase

(ˈpleɪ dʒi əˌkleɪs)

n.

any of the feldspar minerals varying in composition from albite, NaAlSi₃O₈, to anorthite, CaAl₂Si₂O₈.

[1865–70]

pla`gi•o•clas′tic (-ˈklæs tɪk) adj.

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

pla·gi·o·clase

(plā′jē-ə-klās′)

Any of a series of common feldspar minerals, consisting of mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to black. 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.

Thesaurus

Noun

1.

plagioclase - any of a series of triclinic feldspars that form rocks oligoclase dacite - a grey volcanic rock containing plagioclase and quartz and other crystalline minerals basalt - the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene feldspar, felspar - any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium albite, white feldspar - a widely distributed feldspar that forms rocks anorthite - rare plagioclastic feldspar occurring in many igneous rocks

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