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feldspar-quartz
According to this classification, the petrochemical types A-E may be correlated with monomictic (A'), oligomictic (B'), and mesomictic (C') sandstones, feldspar-quartz graywacke (D') and graywacke proper (E'), respectively.
      
Aggregates of black-colored minerals are not the products of the fractionation of the initial magma or immiscibility effects, because the structure of the albite-potassium feldspar-quartz-mica matrix is the same both in black and light granites.
      
The ores are underlain by comformable alteration zones characterized by albite-gedrite-quartz and biotite-muscovite-plagioclase-K-feldspar-quartz +/- garnet assemblages.
      
In augite-hornblende monzodiorite, alteration progressed from a hematite-stained alkali feldspar-quartz-calcite assemblage and quartz-molybdenite-pyrite veins to a late reduced sericite-dolomite-albite assemblage.
      
Garnet-biotitesillimanite-K feldspar-quartz relations combined with the partial melting data suggest a decrease in water activity from near 1.0 in the lower grade zones to 0.5±0.2 in the Broken Hill - Little Broken Hill part of the two pyroxene zone.
      
From cordierite-garnet-sillimanite-biotite-K feldspar-quartz assemblages, a P estimate of 4.1±0.4 kbar is obtained, with the aqueous fluid having
      
Subsequent reaction textures include the replacement of spinel and cordierite by sillimanite and hypersthene and formation of sapphirine-hypersthene-K-feldspar-quartz symplectites which are interpreted as pseudomorphs after osumilite.
      
It is suspected that many biotite-feldspar-quartz-orthopyroxene bearing low temperature volcanic rocks inherit orthopyroxene xenocrysts which crystallized earlier in the cooling history of the magma body.
      
Water and halogen acid fugacities calculated from biotite-olivine/orthopyroxene-feldspar-quartz equilibria and the above fugacity ratios are 1510-2790 bars for H2O, 1.3-5.3 bars for HF and 7-600 bars for HCl.
      
K-feldspar-quartz and K-feldspar-plagioclase phase boundary interactions in garnet-orthopyroxene gneiss's from the Val Strona di
      
?Part of the Mesoproterozoic (1.6?Ga) Gawler Range Volcanics in South Australia is composed of mingled feldspar- quartz- phyric dacite, rhyodacite and rhyolite lavas.
      
Beneficiation of granites and feldspar-quartz sands for fine ceramics
      
The plumose alkali feldspar-quartz intergrowths measure 2 mm to 20 cm in length and typically occur as layers of megacrysts in an aplitic matrix.
      
 

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