perthite

an intimate mixture of either microcline or orthoclase and a sodium-rich plagioclase (commonly albite).
Found on https://www.encyclo.co.uk/local/20132

Perthite

Perth'ite noun [ So called from Perth , in canada.] (Min.) A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors. -- Per*thit'ic adjective
Found on http://www.encyclo.co.uk/webster/P/63

Perthite

• (n.) A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors.
Found on http://thinkexist.com/dictionary/meaning/perthite/

perthite

any member of a class of alkali feldspars in which tiny crystals of sodium-rich feldspar (albite; NaAlSi3O8) are intimately intergrown with, but ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/p/48

Perthite

Perthite is a variety of orthoclase feldspar or microcline in which small veinlets of plagioclase feldspar (albite) are present. It is a common mineral in rocks such as granite and syenite.
Found on http://www.probertencyclopaedia.com/browse/HP.HTM

Perthite

Perthite is used to describe an intergrowth of two feldspars: a host grain of potassium-rich alkali feldspar (near K-feldspar, KAlSi3O8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi3O8, in composition). Typically the host grain is orthoclase or microcline, and the lamellae are a...
Found on http://en.wikipedia.org/wiki/Perthite

Perthite

Describes the intergrowth of two feldspars; potassium-rich alkali feldspar, and lamellae intergrowths of sodic alkali feldspar.
Found on http://www.allaboutgemstones.com/glossary_gemology.html
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