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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.


(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
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Our data do not provide a definitive answer to that question, which would require more petrological studies and/or geochronology, but the [sup.40]Ar/[sup.39]Ar cooling age of 421 [+ or -] 4 Ma for phlogopite in a gabbroic unit in the Moosehorn Plutonic Suite suggests that it is more likely the Baring Granite.
The crystals are of two types: "mica schist-hosted" crystals are heavily infused with dark phlogopite and tend to be blackish, at least in their outer zones, resembling old Russian emerald crystals; "quartz-hosted" emeralds occur in very rare pockets and, more commonly, in boudin structures which have been flooded with silica.
Premium grades of highly pure, low-iron, platy talcs, high-purity calcium carbonates, phlogopite micas, and ground white barium sulfate for high-density compounds.
This may reflect retention of Rb in phlogopite at low percentages of melting (highest Sr rocks).
Phlogopite mica is an excellent glass extender in glass-filled nylon and polyolefins.
In fact, 1990 output was 6.8 Mt of ore and 1.4 Mt of waste for the production of 546,134 t of apatite concentrate, 97,852 t of agricultural lime and 4,763 t of phlogopite mica.
This is a monomineral rock composed of calcite, with occasional phlogopite flakes.
4c and d).The volcanics in Bhm where least altered are petrographically basanite and alkali- basalt contain phenocrysts of olivine and augite with a groundmass consisting of plagioclase, pargasite, phlogopite and opaque and glassy material.
In both modes of occurrence, its composition is intermediate between phlogopite and annite, with relatively low aluminum content, and it plots in the field for calc-alkalic orogenic suites in the ternary MgO-Fe[O.sup.t]-[Al.sub.2][O.sub.3] discrimination diagram (Fig.
Several of his specimens were illustrated in the 6th edition of Dana's System of Mineralogy--for example, phlogopite form Clark's Hill, St.