Perthite - Wikipedia
网页Perthite 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 lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi 3 O 8, in composition).
Perthite: Mineral information, data and localities. - mindat.org
网页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 microcline host, occasionally also with an orthoclase host.
Perthite | Plagioclase, Feldspar, Crystalline | Britannica
网页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 potassium-rich feldspar (orthoclase or, less commonly, microcline; KAlSi 3 O 8).
perthite - Minerals
网页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 many different types of Perthite.
Perthite - ALEX STREKEISEN
网页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 lamellae of sodic feldspar within potassic alkali feldspar, however, the term perthite is often used to describe all types of exsolution in the feldspars.
Perthite - an overview | ScienceDirect Topics
网页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 an antiperthite.
Perthite and Perthitic Texture | Earth Know
网页2024年4月21日 — What does perthite mean? Perthite is an alkali feldspar intergrowth in which sodium plagioclase, usually albite and less often oligoclase lamellae, exsolves in potassium feldspar, usually microcline but sometimes orthoclase.
Perthite Gemstone: Properties, Meanings, Value & More - Gem …
网页2023年7月24日 — Perthite is a mixture of feldspars, usually albite with orthoclase or microcline. Amazonite, moonstone, and rainbow lattice sunstone are sometimes perthites. Learn all about perthite in this guide!
Perthite Value, Price, and Jewelry Information
网页Perthite is a blend of microcline, albite and oligoclase. It is usually brown and white. May have gold or white iridescence.
GemRocks: Perthite - Central Michigan University
网页DESCRIPTION: Perthite is the name given intimate intermixtures of a potassium feldspar (KAlSi 3 O 8) – either microcline or orthoclase – and the sodium-rich plagioclase feldspar albite (NaAlSi 3 O 8), with potassium feldpar the predominant constituent.
- 某些结果已被删除
跳至内容