orthoclase feldspars

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• Orthoclase — General Category Silicate mineral Chemical formula KAlSi3O8 …   Wikipedia

• orthoclase — /awr theuh klays , klayz /, n. a common white or pink mineral of the feldspar group, KAlSi3O8, having two good cleavages at right angles, and found in silica rich igneous rocks: used in the manufacture of porcelain. [1840 50; ORTHO + clase < Gk… …   Universalium

• Some typical occurrences of the rock-forming feldspars — ▪ Table Some typical occurrences of the rock forming feldspars Potassium feldspars* sanidine potassium rich volcanic rocks and near surface minor intrusions e.g., rhyolites, trachytes, and high temperature contact metamorphic rocks orthoclase… …   Universalium

• Monzonite — Photomicrograph of thin section of monzonite (in cross polarised light) …   Wikipedia

• feldspar — /feld spahr , fel /, n. any of a group of minerals, principally aluminosilicates of potassium, sodium, and calcium, characterized by two cleavages at nearly right angles: one of the most important constituents of igneous rocks. Also, felspar.… …   Universalium

• Feldspar — is the name of a group of rock forming minerals which make up as much as 60% of the Earth s crust.Feldspar. [http://www.ima na.org/about industrial minerals/feldspar.asp What is Feldspar?] Industrial Minerals Association. Retrieved on July 18… …   Wikipedia

• Celsian — is an uncommon feldspar mineral, barium aluminosilicate, BaAl2Si2O8. The mineral occurs in contact metamorphic rocks with significant barium content. Its crystal system is monoclinic, and it is white, yellow, or transparent in appearance. In pure …   Wikipedia

• Microspherulite — Microspherulites are microscopic spherical particles with < 2 mm diameters, usually in the 100 micrometre range, mainly consisting of mineral material (the Greek litos means stone ). Only bodies created by natural physico chemical… …   Wikipedia

• Microcline — Optical properties Microcline Microcline feldspar Crystal System: Triclinic Color in PPL …   Wikipedia

• alkali feldspar — Any of several common silicate minerals that often occur as whitish to variously coloured, glassy crystals. The alkali feldspars may be regarded as mixtures of sodium aluminosilicate (NaAlSi3O8) and potassium aluminosilicate (KAlSi3O8). Both the… …   Universalium

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium