
Perthite - Wikipedia
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 …
Perthite: Mineral information, data and localities. - mindat.org
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 …
Perthite - ALEX STREKEISEN
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 | Plagioclase, Feldspar, Crystalline | Britannica
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 …
Perthite - an overview | ScienceDirect Topics
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 …
PERTHITE Definition & Meaning - Merriam-Webster
The meaning of PERTHITE is a feldspar rock consisting of orthoclase or microcline in which is interlaminated albite.
Perthite Value, Price, and Jewelry Information
Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have gold or white iridescence.
Perthite and Perthitic Texture | Earth Know
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 - Minerals
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 …
Perthite - Clark Science Center
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 …