Perthite or perthitic texture is used to describe an intergrowth of two feldspars: a host grain of potassium -rich alkali feldspar (near K-feldspar, KAlSi 3 O 8, in composition) includes exsolved …

Named for the nearby city of Perth in Ontario. The type locality is 6 miles (approx 9.5 km) southwest of Perth. A variety of Feldspar Group An intergrowth of albite or oligoclase with a …

A perthite is an intimate intergrowth of sodic and potassic feldspar resulting from subsolidus exsolution (unmixing of two minerals). Strictly speaking a perthite has blebs or irregular …

perthite, any member of a class of alkali feldspars in which tiny crystals of sodium-rich feldspar (albite; NaAlSi 3 O 8) are intimately intergrown with, but distinct from, tiny crystals of …

To distinguish the difference between perthite and antiperthite is to determine which the predominant feldspar is. If K-feldspar predominates, it is a perthite. If Albite predominates, it is …

The meaning of PERTHITE is a feldspar rock consisting of orthoclase or microcline in which is interlaminated albite.

Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have gold or white iridescence.

Apr 21, 2024 · Perthite describes an intimate intergrowth of alkali feldspars, in which sodium plagioclase lamellae, blebs, or droplets exsolve in potassium feldspar. To exsolve means to …

Perthite is an intergrowth of two different Feldspar minerals in one rock. Perthite is usually composed of vein s or stripes of one feldspar running through a different feldspar. There are …

Mircoperthite is only seen microscopically, cryptoperthite is submicroscopic and needs x-ray diffraction to see extremely fine lamellae. Appear in thin section as felsic thin parallel wispy …