• Orthoclase - Wikipedia

    en.wikipedia.org/wiki/Orthoclase Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock.The name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as K-feldspar.The gem known as moonstone (see below) is largely composed of orthoclase.
  • Orthoclase: Pink granite, Mohs hardness and moonstone

    geology.com/minerals/orthoclase.shtml What Is Orthoclase? Orthoclase is a feldspar mineral with a chemical composition of KAlSi 3 O 8.It is one of the most abundant rock-forming minerals of the continental crust. Orthoclase is most widely known as the pink feldspar found in many granites and as the mineral assigned a hardness of "6" in the Mohs hardness scale.
  • Orthoclase | mineral | Britannica

    www.britannica.com/science/orthoclase Orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi3O8); it usually occurs as variously coloured, frequently twinned crystals in granite. Orthoclase is used in the manufacture of glass and ceramics; occasionally, transparent crystals are cut as gems. Orthoclase is
  • Orthoclase: The mineral Orthoclase information and pictures

    www.minerals.net/mineral/orthoclase.aspx Orthoclase is industrially important in the manufacture of glass and ceramics. Orthoclase crystals and twins provide information on the formation of minerals and environmental factors. Well shaped crystals and twins are highly sought after by mineral collectors, and the Moonstone variety is used as a gemstone. For additional information, see the gemstone section on Orthoclase and Moonstone.
  • Orthoclase Mineral Physical-Optical Properties, Uses ...

    geologyscience.com/minerals/orthoclase Orthoclase appears as well-formed, short, prismatic crystals, which are frequently twinned. It may also occur in massive form. Moonstone is a variety of orthoclase that exhibits a schiller effect. Pure orthoclase is rare some sodium is usually present in the structure.
  • Orthoclase - an overview | ScienceDirect Topics

    www.sciencedirect.com/topics/earth-and-planetary-sciences/orthoclase Orthoclase feldspar may arise from regional metamorphic processes, and is a common ingredient in various crystalline schists (Table 6.1). Orthoclase changes to kaolinite (Section 5.2.1.2) and sericite with the process of kaolinization and sericitization, respectively.
  • Orthoclase | AlKO8Si3 - PubChem

    pubchem.ncbi.nlm.nih.gov/compound/Orthoclase Orthoclase | AlKO8Si3 | CID 3080680 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety ...
  • Orthoclase: Mineral information, data and localities.

    www.mindat.org/min-3026.html Barium-Orthoclase: A Ba-bearing orthoclase with K:Ba > 6. Delawarite: A variety of orthoclase with a pearly lustre. Paradoxite: An obsolete name for flesh-coloured orthoclase occurring in hydrothermal veins, originally described from the tin mines near Marienberg, Saxony, Germany by A. Breithaupt in 1866 (Berg. Hüt., xxv, 35. as 'paradoxit')
  • Orthoclase - NOVA Mineralogy

    blogs.nvcc.edu/mineralogy/minerals/orthoclase Orthoclase is frequently known as potassium feldspar or K-spar, and is easily distinguished from the plagioclase feldspars in hand sample by its lack of striations. In thin section, alkali feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the alkali feldspar page. Physical Properties … Continue reading Orthoclase ...
  • Orthoclase Gemstone Information - GemSelect

    www.gemselect.com/gem-info/orthoclase/orthoclase-info.php Orthoclase is a rare gemstone that belongs to the feldspar group, which also includes moonstone, amazonite, spectrolite and labradorite.Therefore, orthoclase is sometimes also called "K-spar". Orthoclase gemstones are typically champagne yellow, golden yellow or greenish, though they can be other colors.