• 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 is found worldwide. Only a select few localities are mentioned. The original Carlsbad twins were described from Karlovy Vary (Carlsbad), Bohemia, Czech Republic. Some of the best crystals come from Baveno, Piedmont, Italy, especially the famous Baveno twins.
  • Orthoclase: Mineral information, data and localities.

    www.mindat.org/min-3026.html Named "orthose" in 1801 by Rene Just Haüy from the Greek orthos - "right" in allusion to the mineral's right angle of good cleavage. The sense of Haüy's name was that the mineral was a feldspar, but he did not specify a type-locality, nor did Haüy give a chemical analysis.
  • Orthoclase | mineral | Britannica

    www.britannica.com/science/orthoclase Orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi 3 O 8); 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 primarily important as a rock-forming mineral, however, and is abundant in alkali and acidic igneous ...
  • 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 | Definition of Orthoclase at Dictionary.com

    www.dictionary.com/browse/orthoclase Orthoclase definition, 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. See more.
  • 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 | 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 - Smith College

    www.science.smith.edu/departments/geosciences/petrology/.../orthoclase.html This whitish orthoclase crystal exhibits low birefringince color under crossed polars: Orthoclase crystal showing extinction patterns. Notice the cleavage of 90 degrees in the center of the crystal.