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feldspar
The rocks are classified into greywackes or feldspar sandstones, grains of which are the mixtures of mafic rocks, felsic rocks, and quartz+calcite.
      
In conjunction with high abundances of Ba and Sr, as well as low abundances of Y and HREE, these patterns suggest a feldspar-poor, garnet±amohibole-rich fractionation mineral assemblage.
      
Empirical relationships describing the composition dependences of the chemical durability of glasses in the diopside-albite, diopside-anorthite, diopside-orthoclase, diopside-quartz, and diopside-feldspar systems are derived.
      
Two glasses of the same chemical composition manufactured while using two different sources of aluminosilicates: (1) sodium feldspar and (2) volcanic tuffs have been compared [1].
      
The influence of bacterial activity on glauconite formation is supported by the study of dissolution zones on quartz and feldspar grains, which revealed biomorphic structures akin to fossilized bacteria.
      
Two productive zones-the normal kaolin (kaolinite + quartz) zone and the alkaline kaolin (kaolinite + quartz + potassium feldspar and/or muscovite) zones-are recognized in the weathering profile of leucogranites of the Upper Ushkoty Pluton.
      
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.
      
Electron microscopic studies revealed intra- and intergranural fissures transsecting mafic, quartz, and feldspar minerals in the crushed zone.
      
The sorption power of the basic rock-forming minerals of granitoids decreases in the order biotite >amp;gt; feldspar >amp;gt; quartz.
      
There are obvious signatures of old lava outflows and the heterogeneous composition of the crust depleted in FeO (less than 3%) and enriched with feldspar, with the possible presence of low-iron pyroxenes and alkali basalts.
      
The prevalence of pyroxene over olivine and feldspar in the computed compositions of S-type asteroids suggests the probable presence of basalts on their surfaces.
      
Refinement of the crystal structure of sanidine-like feldspar
      
Iron-containing potassium feldspar crystals are prepared using the hydrothermal synthesis in an alkaline medium at temperatures ranging from 500 to 52°C.
      
The crystal structure of the synthetic potassium feldspar is refined [Ital Structures diffractometer, MoKαradiation, 1327 unique reflections with Fs>amp;gt;σ(F), anisotropic approximation, R(F) = 0.044].
      
According to this distribution, the iron-containing potassium feldspar is assigned to the low ferrialuminosilicate sanidine.
      
Potassium feldspar from vein systems and their aureoles at the epithermal asachin gold-silver deposit, Southern Kachatka
      
The third-group of granitoids were melted out of Early Proterozoic crustal feldspar-rich granulites of variable basicity, with minor amounts of Archean crustal material.
      
A mechanism is proposed to explain the genesis of biotite-quartz-feldspar plagiomigmatite leucosomes as a consequence of the reaction of an amphibolite protolith with ascending fluid.
      
Galena, sphalerite, chalcopyrite, pyrite, pyrrhotite, and arsenopyrite are the most abundant sulfides, while quartz, carbonates, chlorite, sericite, and feldspar are gangue minerals.
      
According to geothermometric data and the composition of rock-forming minerals, the dolomite-calcite carbonatites were formed under K-feldspar-calcite, albite-calcite, and amphibole-dolomite-calcite facies conditions at 575-300°C.
      
 

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