orthoclase

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Definition of orthoclase in English English dictionary: Potassium aluminum silicate, KAlSi3O8, 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; Common alkali feldspar mineral, potassium aluminosilicate (KAlSi3O8), that usually occurs as variously coloured grains in granite. Orthoclase is used in the manufacture of glass and ceramics; occasionally, transparent crystals are cut as gems. It is primarily important as a rock-forming mineral, however, and is abundant in igneous rocks, pegmatites, and gneisses. The feldspar minerals consist of sodium, potassium, and calcium aluminosilicates, and any feldspar may be chemically classed by the percentage of each of these three pure compounds, called end-members. Orthoclase is the potassium-bearing end-member of the system. Microcline is a lower temperature structural form of the same chemical composition as orthoclase; Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other; 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; a white or colored monoclinic feldspar

orthoclase

Hyphenation

or·tho·clase

ôrthıkleys

/ˈôrᴛʜəˌklās/ /ˈɔːrθəˌkleɪs/

() ortho (from Greek orthos, straight, perpendicular) + clase (from Greek klastos, broken, to break).

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