Definitions
orthoclase Tweet Definition of orthoclase Like Definition of orthoclase on Facebook
noun
  1. (mineralogy) A common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel.
  • Chemical composition: Potassium aluminum silicate, <math>KAlSi?_3O_8</math>
  • Physical properties:
    Moh's Hardness: 6.0
    Specific gravity: 2.6
    Color: white, flesh, yellow, brown, occasionally colorless
    Luster: glassy
    Fracture: conchoidal
    Cleavage: two good at 90º
  • Habit: Monoclinic - prismatic. Well developed crystal faces are at 90º to each other. Occasional twinned crystals are found. Crystal faces typically look polished, and are not striated.
Translations:
  • Dutch: orthoklaas
  • German: Orthoklas
  • Spanish: ortoclasa
Etymology: ortho (from Greek orthos, straight, perpendicular) + clase (from Greek klastos, broken, to break).


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