Information om | Engelska ordet FELDSPARS

Exempel på hur man kan använda FELDSPARS i en mening

• Sodium is the sixth most abundant element in the Earth's crust and exists in numerous minerals such as feldspars, sodalite, and halite (NaCl).
• The most common members of the feldspar group are the plagioclase (sodium-calcium) feldspars and the alkali (potassium-sodium) feldspars.
• The feldspathoids are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content.
• The region is characterised by high, isolated inselbergs and kopjes (the Afrikaans term for rocky outcrops), made up of dramatic blood-red granites, rich in feldspars and sandstone.
• He wrote especially on the means of determining the different feldspars, and is credited with the discovery of microcline (a triclinic potash-feldspar).
• Nyiragongo's lavas are low-silica, alkali-rich, ultramafic extrusive rocks essentially free of feldspars.
• Frequently found along the Jefferson River, these rocks include layered feldspars, gneiss, glassy quartz, heavy dark amphibolite, and sometimes marble.
• The series is divided into two branches, the continuous (felsic minerals: feldspars) and the discontinuous (mafic minerals).
• The state has significant mineral resource potential, especially in the non-metallic category, among which are sand and gravel, red clay, limestone, talc, marble, feldspathic sands, peat, feldspars, and gypsum.
• It is also a product of hydrothermal alteration of various minerals (feldspars, micas, pyroxenes, amphiboles, garnets, and others) composing igneous rocks.
• Potassium is a common element found in many materials, such as feldspars, micas, clay minerals, tephra, and evaporites.
• optically stimulated luminescence (OSL) — for absolutely dating and relatively profiling buried land-surfaces in vertical and horizontal stratigraphic sections, most often by measuring photons discharged from grains of quartz within sedimentary bodies (although this technique can also measure potassium feldspars, complications caused by internally induced dose-rates often favor the use of quartz-based analyzes in archaeological applications).
• His studies of the eruptive rocks of Corsica, Santorini and elsewhere; his researches on the artificial reproduction of eruptive rocks, and his treatise on the optical characters of feldspars deserve special mention; but he was perhaps best known for the joint work which he carried on with his friend Auguste Michel-Lévy.
• Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars.
• They are medium to coarse–grained and mainly composed of feldspars sometimes associated with quartz and anhydrous ferromagnesian minerals, with granoblastic texture and gneissose to massive structure.
• If sodic feldspar is the dominant phase, the result is an antiperthite and where the feldspars are in roughly equal proportions the result is a mesoperthite.
• When the mineral composition of mudstones has been determined, using such techniques as scanning electron microscopy, electron probe microanalysis, or X-ray diffraction analysis, they have been found to be composed primarily of clay minerals, quartz, and feldspars, with a variety of accessory minerals.
• Sericite is produced by the alteration of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration (also see Sericitic alteration) typically associated with copper, tin, or other hydrothermal ore deposits.
• In later years he devoted himself largely to petrology, and published memoirs on the trachytes of Hungary and Transylvania; on a new method of determining the species of feldspars in rocks, depending on fusibility and flame-coloration; on the geology and petrology of the district of Schemnitz; and on Santorin Island.
• Kaolinization is the decomposition of the feldspars, which are the most common minerals in igneous rocks, into kaolin (along with quartz and other clay minerals); it is best shown by granites and syenites.

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