Definitions for orthoclaseˈɔr θəˌkleɪs, -ˌkleɪz

This page provides all possible meanings and translations of the word orthoclase

Random House Webster's College Dictionary

or•tho•claseˈɔr θəˌkleɪs, -ˌkleɪz(n.)

  1. a common white or pink potassium feldspar mineral, KAlSi3O8, having two good cleavages at right angles, and found in silica-rich igneous rocks.

    Category: Mineralogy

Origin of orthoclase:


Princeton's WordNet

  1. orthoclase(noun)

    a white or colored monoclinic feldspar


  1. orthoclase(Noun)

    Potassium aluminum silicate, KAlSiO, 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.

  2. Origin: κλαστός


  1. Orthoclase

    Orthoclase is an important tectosilicate mineral which forms igneous rock. The name is from the Greek for "straight fracture," because its two cleavage planes are at right angles to each other. Alternate names are alkali feldspar, potassium feldspar and K-feldspar. The gem known as moonstone is largely composed of orthoclase.


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