 | | Book | | constituents the three rock-forming minerals feldspar, quartz and mica, which in places develop mega-crystals...material extracted from pegmatites is feldspar, quartz and mica, and only a tiny fraction of pegmatites...high-purity quartz at the core of the pegmatite is concerned. In comparison with other pegmatite deposits...Hagendorf-Pleystein Pegmatite Province (HPPP) is not only the largest concentration of feldspar and quartz of its...everything has been told about this prominent pegmatite. Professor Strunz was a generous and open-minded |  | | Book | | and structure of the Moine Schists in the Morar district, western Inverness-shire. Abstract. Proc. geol...the sedimentary-volcanic sequences in the Kenema district of Sierra Leone reach the amphibolite and granulite...rest on basement older than 2900 m.y., and that a quartz-porphyry high in the Ventersdorp sequence has given...ages of 1850-2050 m.y. have been obtained for pegmatite minerals (Cahen, 1961, p. 546; Cahen and Snelling...Lukoshi Formation (Fig. 2); muscovite from a pegmatite cutting a manganese member of the Lukoshi sediments |  | | Journal (article/letter/editorial) | | Pyromorphite Pyrophyllite Pyroxmangite Pyrrhotite Quartz, lechatelierite, keatite, stishovite, christobalite...double-triangular plot also called Q–A–P–F diagram (quartz, alkaline feldspar, plagioclase, and foid) designed...wolframite, tetrahedrite and base metal sulfide quartz veins have successfully been used to constrain...feldspar, quartz and some mica. Heavy minerals with specific gravities exceeding that of quartz are minor...Granite characterized by alkaline feldspar and quartz with little or no mafic minerals. Porphyritic igneous | | | Journal (article/letter/editorial) | | Pyromorphite Pyrophyllite Pyroxmangite Pyrrhotite Quartz, lechatelierite, keatite, stishovite, christobalite...double-triangular plot also called Q–A–P–F diagram (quartz, alkaline feldspar, plagioclase, and foid) designed...wolframite, tetrahedrite and base metal sulfide quartz veins have successfully been used to constrain...feldspar, quartz and some mica. Heavy minerals with specific gravities exceeding that of quartz are minor...Granite characterized by alkaline feldspar and quartz with little or no mafic minerals. Porphyritic igneous |
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