phlogopite

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phlog·o·pite

 (flŏg′ə-pīt′)
n.
A yellow to dark brown mica, K(Mg,Fe)3AlSi3O10(OH)2, used in insulation.

[Greek phlogōpos, fiery-looking (phlox, phlog-, flame; see bhel- in Indo-European roots + ōps, ōp-, eye, face; see okw- in Indo-European roots) + -ite.]
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.

phlogopite

(ˈflɒɡəˌpaɪt)
n
(Minerals) a brownish mica consisting of a hydrous silicate of potassium, magnesium, and aluminium, occurring principally in metamorphic limestones and ultrabasic rocks. Formula: KMg3AlSi3O10(OH)2. See also mica
[C19: from Greek phlogōpos of fiery appearance, from phlox flame +ōps eye]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.phlogopite - a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum
isinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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In addition, and whilst not a definitive metallurgical study, Dr Halley's work indicated that gold is depleted in the upper oxide area and enriched in the lower oxide to fresh rock transition, and the strongest mineralised zones are also depleted in calcium in phengitic altered zones (phengite is a greenish potassium magnesium mica mineral).