Noun
A kind of feldspar consisting of a laminated intertexture of albite and orthoclase, usually of different colors.
Source: Webster's dictionaryPerthite is a typical texture in alkali feldspar, due to exsolution of contrasting alkali feldspar compositions during cooling of an intermediate composition. Source: Internet
Feldspar (Amazonite) Perthite is either microcline or orthoclase with thin lamellae of exsolved albite. Source: Internet
In the acid rocks the common feldspars are orthoclase, perthite, microcline, and oligoclase—all having much silica and alkalis. Source: Internet
If the high temperature intermediate composition alkali feldspars are allowed to cool slowly, exsolution occurs and a perthite structure results. Source: Internet