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 - an overview | ScienceDirect Topics
Antiperthite is albitic plagioclase with small discrete K-feldspar that has become exsolved from the albite. To distinguish the difference between perthite and antiperthite is to determine which the …
Chapter 3 Perthites, Mesoperthites, Antiperthites and Peristerites ...
According to this idea of Kohler, the phenomenon described by ROBERTSON (1959) and mentioned in the foregoing paragraph could better be called antiperthite, if only because the …
Perthite - ALEX STREKEISEN
An antiperthite is an intergrowth arising due to exsolution where potassic feldspar is present as blebs or lamellae within a sodic feldspar. The term mesoperthite is used when sodic and …
Perthite - Clark Science Center
The less abundant phase forms into irregular, crystallographically-oriented planar bands within the more abundant host during cooling. The exsolution lamellae of Na- and K-rich feldspar are …
Antiperthite - ALEX STREKEISEN
An Antiperthite is an intergrowth an intergrowth of orthoclase (often as lamellae) enclosed in a plagioclase host. Many minerals that show complete solid solution at higher temperatures do …
Antiperthite | mineral | 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 …
Chapter 3 Perthites, Mesoperthites, Antiperthites and Peristerites ...
According to some authors, these antiperthites are the result of unmixing; others advocate a different genesis. Lamellar aggregates composed of lamellae with an albite composition …
Discussion About the Origin of Mineral Textures in Granite
2016年5月21日 · 3.3.6 Antiperthite. Antiperthite is intergrowths of guest K-feldspars in host plagioclase, i.e., the inverse of perthite. Antiperthite is commonly seen in granites poor in …
Where the felsic diorite layers are slightly deformed, K-feldspar is first seen in a non-uniform distribution in interiors of some deformed plagioclase to form antiperthite (Fig. 2). Fig. 2. …
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