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WordReference Random House Unabridged Dictionary of American English © 2024or•tho•clase (ôr′thə klās′, -klāz′),USA pronunciation n. - Mineralogya 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.
- Greek klásis cleavage, breaking
- ortho- + -clase 1840–50
Collins Concise English Dictionary © HarperCollins Publishers:: orthoclase /ˈɔːθəʊˌkleɪs -ˌkleɪz/ n - a white to pale yellow, red, or green mineral of the feldspar group, found in igneous, sedimentary, and metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: potassium aluminium silicate. Formula: KAlSi3O8. Crystal structure: monoclinic
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