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perthite

perthite A series of layers that occurs as intergrowths in alkali feldspars which form at high temperatures and cool slowly, unmixing as they cool. Most alkali feldspars in such slowly cooled rocks (e.g. plutonic and igneous) consist of an alkali feldspar host with an exsolved, sodium-rich, plagioclase feldspar phase that segregated from the alkali feldspar during cooling. Perthitic intergrowths have textures ranging from macroperthite (visible to the naked eye) through microperthite (visible under a microscope) to cryptoperthite (which can be detected only by X-ray diffraction and other techniques). The nature of the perthite depends upon the ordering of the silicon and aluminium atoms achieved by the mineral lattice as it cools.

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feldspars

feldspars The most important group of rock-forming silicate minerals, including the alkali feldspars KAlSi3O8 to NaAlSi3O8 (K-feldspar to albite) and the plagioclase feldspars NaAlSi3O8 to CaAl2Si2O8 ( albite to anorthite). The potassium, sodium, and calcium end-members can be taken to represent the three apices of an equilateral triangle into which all the alkali feldspars and the plagioclase feldspars can be plotted (usually with the plagioclase feldspars along the base of the triangle and the alkali feldspars along the left-hand side).

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microcline

microcline: see feldspar.

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microcline

microcline See ALKALI FELDSPAR.

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microcline

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