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phlogopite

[flog-uh-pahyt]
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noun
  1. a magnesium-rich mica mineral, usually yellowish-brown, but sometimes reddish-brown.
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Origin of phlogopite

1840–50; < Greek phlogōp(ós) fiery-looking (phlog-, stem of phlóx flame + ōp(ḗ) view, look + -os adj. suffix) + -ite1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phlogopite

phlogopite

noun
  1. a brownish mica consisting of a hydrous silicate of potassium, magnesium, and aluminium, occurring principally in metamorphic limestones and ultrabasic rocks. Formula: KMg 3 AlSi 3 O 10 (OH) 2See also mica
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Word Origin

C19: from Greek phlogōpos of fiery appearance, from phlox flame + ōps eye
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

phlogopite in Science

phlogopite

[flŏgə-pīt′]
  1. A yellow to dark-brown mica. Phlogopite is monoclinic and is usually found in limestone. It is used in insulation. Chemical formula: K(Mg,Fe)3AlSi3O10(OH)2.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.