MICROCLINE Definition & Meaning

microcline

[ mahy-kruh-klahyn ]

Phonetic (Standard)IPA

a mineral of the feldspar group, potassium aluminum silicate, KAlSi 3 O 8 , identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in making porcelain.

microcline

/ ˈ��ɪ��əʊˌ��ɪ�� /

a white, creamy yellow, red, or green mineral of the feldspar group, found in igneous, sedimentary, and metamorphic rocks: used in the manufacture of glass and ceramics. Composition: potassium aluminium silicate. Formula: KAlSi 3 O 8 . Crystal structure: triclinic

microcline

/ ��ī′��ō-��ī��′ /

A white, pink, red-brown, or green type of potassium feldspar. It is dimorphous with orthoclase feldspar, differing from it in shape and in the fact that it forms at lower temperatures. Chemical formula: KAlSi 3 O 8 .

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1840–50; micro- + -cline < Greek ��ī́�Ա𾱲� to lean ¹, referring to the angles between its cleavage planes, which differ slightly from 90°

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C19: from German Mikroklin, from mikro- micro- + Greek klinein to lean; so called because its cleavage plane is slightly different from 90°

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Examples have not been reviewed.

At Danbury the mineral occurs with microcline and oligoclase embedded in dolomite.

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Last come orthoclase, quartz, microcline and micropegmatite, which fill up the irregular spaces left between the earlier minerals.

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These larger felspars have no crystalline outlines and consist of orthoclase or microcline surrounded by borders of white oligoclase.

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The felspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.

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There are also placed in the anorthic class a potash-felspar called microcline, and a rare soda-potash-felspar known as anorthoclase.

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