Definition of Perthitic. Meaning of Perthitic. Synonyms of Perthitic

- Perthite or perthitic texture is used to describe an intergrowth of two feldspars: a host grain of pot****ium-rich alkali feldspar (near K-feldspar, KAlSi3O8...
- Major minerals include plagioclase, microcline, quartz, and muscovite. Perthitic textures on the microcline are possible. Minor minerals include biotite...
- feldspar compositions during cooling of an intermediate composition. The perthitic textures in the alkali feldspars of many granites can be seen with the...
- be on a scale from microscopic to readily observable in hand-sample; perthitic texture forms when Na-rich feldspar exsolve in a K-rich host. The opposite...
- with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundm****...
- volcanics, which they intrude into. They are granite with granophyric quartz, perthitic pot****ium feldspar, biotite and magnetite. They are intrusive into the...
- feldspar in granites is typically orthoclase or microcline and is often perthitic. The plagioclase is typically sodium-rich oligoclase. Phenocrysts are...
- 35% of the feldspar content. Such feldspars often are interleaved as perthitic components of the rock. When ferromagnesian minerals are present in syenite...
- Syenite all contain primarily alkali feldspar, with many rocks displaying perthitic igneous texture. The perthites range from microperthite (lamellae barely...
- some of the zones are often very rich in quartz and feldspar. Graphic or perthitic intergrowths between the minerals of a zone are frequent. The spheroids...