phengite


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phengite

(ˈfɛnˌdʒaɪt)
n
1. (Geological Science) a type of transparent selenite
2. (Geological Science) a type of mica or muscovite
References in periodicals archive ?
Phengite geobarometry based on the limiting assemblage with K-feldspar, phlogopite, and quartz.
In argillite rock, the minerals glauconite, phengite and illite, observed by DRX, constitute the main potential K sources (Figure 1C).
Analyses of the multiequilibrium between chlorite and phengite solide solution following Lanari et al (2010) method, allow the estimation of metamorphic conditions at 400degC for 5 Kbar for this last event.
These cavities are partially filled with chlorite, Mg-celadonite, illite, phengite micas or quartz.
Eclogites are fine-grained rocks consisting of garnet porphyroblasts set in a matrix of omphacite (25%), amphibole (hornblende or barroisite) (20%), plagioclase and zoisite; rutile often rimmed by titanite occurs as the main accessory mineral phase, phengite is quite rare whereas quartz is nearly absent.
Jitang metamorphic complexes: 40Ar/39Ar age of Phengite in Mica-quartzose Schist 230+-1 Ma (Wang GH, 2008); Gemuri metamorphic complexes: Ar-Ar age of Glaucophane 222Ma, Crossite 223-220Ma or 221Ma, and Phengite 215Ma (Table 1); Jitang metamorphic complexes in this study: 40Ar/39Ar ages of Phengite in Mica-quartzose Schist 219.
0,5] micas Increasing amounts of Si [right arrow] Increasing amount of Fe [left arrow] Phengite K-Al,Mg,[Fe.
However the corresponding P-T curve (2 kbar, 350[degrees]C; 4 kbar, 310[degrees]C) of the reaction chlorite + K-feldspar = muscovite/ phengite + biotite + quartz + [H.
Mg, Fe, and K addition) modified hydrothermal muscovite into a high-pressure phengite composition.