One of the mysteries of the English language finally explained.
A green, pink, or brown crystalline mineral consisting of potassium-rich feldspar, characteristic of granite and pegmatites.
- ‘They collected several pegmatite pockets in which topaz was associated with both clear and smoky quartz, microcline, albite, muscovite, fluorite, and cassiterite.’
- ‘Well-formed crystals of quartz, microcline, and albite typically line pocket walls.’
- ‘The pegmatite is composed of microcline, plagioclase and quartz with minor amounts of clinopyroxene, orthopyroxene, ilmenite and zircon.’
- ‘Also associated with smoky quartz are microcline, fluorite, goethite (some as ‘onegite’), and topaz.’
- ‘The aegirine was associated with aesthetic smoky quartz, microcline, and zircon.’
Mid 19th century: from German Microklin, from Greek mikros ‘small’ + klinein ‘to lean’ (because its angle of cleavage differs only slightly from 90 degrees).
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