• 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: The mineral Orthoclase information and pictures

    www.minerals.net/mineral/orthoclase.aspx Orthoclase is one of the most common minerals, and occurs in numerous mineral environments. It is polymorphous with the minerals Microcline and Sanidine.These three minerals form the Potassium Feldspar group.They are almost identical in physical properties, and it is sometimes impossible to distinguish one another without x-ray analysis.
  • Orthoclase | Definition of Orthoclase by Merriam-Webster

    www.merriam-webster.com/dictionary/orthoclase Orthoclase definition is - a monoclinic mineral of the feldspar group consisting of a silicate of potassium and aluminum.
  • 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 Mineral Data

    webmineral.com/data/Orthoclase.shtml General Orthoclase Information : Chemical Formula: KAlSi3O8 : Composition: Molecular Weight = 278.33 gm Potassium 14.05 % K 16.92 % K 2 O: Aluminum 9.69 % Al 18.32 % Al 2 O 3: Silicon 30.27 % Si 64.76 % SiO 2: Oxygen 45.99 % O: 100.00 % 100.00 % = TOTAL OXIDE
  • Orthoclase - an overview | ScienceDirect Topics

    www.sciencedirect.com/topics/earth-and-planetary-sciences/orthoclase Orthoclase (KAlSi 3 O 8) is the monoclinic medium-temperature K–feldspar. It occurs in different ways, usually, by crystallization of magma. It is an important ingredient of all acidic (granite, granodiorite) to neutral (syenite) igneous rocks (Table 4.1). It often occurs in the pegmatite-stage crystallization of magma and is the essential ...
  • 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/hazards/toxicity information, supplier lists, and more. COVID-19 is an emerging, rapidly evolving situation. Get the latest public health information from CDC: https ...
  • 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 - 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 ...