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[awr-thuh-kleys, -kleyz] /ˈɔr θəˌkleɪs, -ˌkleɪz/

a common white or pink mineral of the feldspar group, KAlSi 3 O 8 , having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain.
/ˈɔːθəʊˌkleɪs; -ˌkleɪz/
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
A white, pink, yellow, or brown type of potassium feldspar. It is dimorphous with microcline, being more stable at higher temperatures than it is. Also called: potash feldspar. Chemical formula: KAlSi3O8.


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