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phengite
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phengite
phengite Min. (ˈfɛndʒaɪt) Also 8 fengite; and in Gr.-L. form phengites (fɛnˈdʒaɪtiːz), also corruptly fingites. [ad. L. phengītēs, a. Gr. ϕεγγίτης phengite, selenite, or crystallized gypsum, f. ϕέγγο-ς light, lustre, moonlight: see -ite1 2 b.] 1. A transparent or translucent kind of stone known to t...
Oxford English Dictionary
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Phengite
Phengite is a series name for dioctahedral micas of composition K(Al,Mg)2(OH)2(Si,Al)4O10. The silica content of phengite has been proposed as a geobarometer for the metamorphism of low grade schists.
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Omphacite
Associated minerals in eclogites except the major minerals include rutile, kyanite, phengite, and lawsonite.
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Chlorite group
At higher temperatures, much of the chlorite is destroyed by reactions with either potassium feldspar or phengite mica which produce biotite, muscovite
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specular
specular, a. (ˈspɛkjʊlə(r)) [ad. L. speculāris, f. speculum speculum; or, in senses 6 and 7, f. L. speculārī to spy, observe, specula watch-tower. Cf. F. spéculaire (16th c. in Godef. Compl.), Prov. specular, It. speculare, specolare, Sp. and Pg. especulario.] I. 1. a. specular stone (after L. specu...
Oxford English Dictionary
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Lawsonite
for it is these qualities that affect its abilities to carry water down to mantle depths, similar to other OH-containing phases like antigorite, talc, phengite
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Eclogite
Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, zoisite, dolomite, corundum and, rarely, diamond
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Metamorphic facies
, omphacite
In metagreywackes:
quartz + jadeite + lawsonite ± phengite, glaucophane, chlorite
In metapelites:
phengite + paragonite + carpholite + chlorite + jadeite/omphacite + garnet
In metapelites:
phengite + garnet + kyanite + chloritoid (Mg-rich) + quartz
phengite + kyanite + talc + quartz ± jadeite
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Blueschist
kbar
Ultramafic rocks: serpentinite/lizardite +/- talc +/- zoisite
Pelites: Fe-Mg-carpholite +/- chloritoid +/- kyanite + zoisite +/- pargasite or phengite +/- albite +/- quartz +/- talc +/- garnet
Granites: kyanite +/- paragonite +/- chlorite +/- albite +/- quartz +/- pargasite or phengite
Calc-silicates
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Zeolite facies
Phengite and adularia occur in potassium rich rocks. Minerals in this series include zeolites, albite, and quartz.
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Subduction zone metamorphism
Approximately 90–95% of that water is contained in hydrous minerals, including mica, phengite, amphibole, lawsonite, chlorite, talc, zoisite, and serpentine subducting slab during subduction, giving rise to liquid phases that contain fluid-mobile trace elements due to the breakdown of hydrous minerals such as phengite
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List of minerals
cummingtonite)
Malacolite (synonym of diopside)
Manganocolumbite (synonym of columbite-(Mn))
Manganotantalite (synonym of tantalite-(Mn))
Mariposite (variety of phengite Parachrysotile (a polytype of chrysotile)
Pelagosite (variety of aragonite)
Pericline (variety of albite)
Peridot (gem-quality olivine)
Perlite (volcanic glass)
Phengite
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