Английская Википедия:Feldspathoid

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Версия от 04:03, 7 марта 2024; EducationBot (обсуждение | вклад) (Новая страница: «{{Английская Википедия/Панель перехода}} {{short description|Mineral grouping of silica-poor tectosilicates}} The '''feldspathoids''' are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content. They occur in rare and unusual types of igneous rocks, and are usually not found in rocks containing primary quartz....»)
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Шаблон:Short description The feldspathoids are a group of tectosilicate minerals which resemble feldspars but have a different structure and much lower silica content. They occur in rare and unusual types of igneous rocks, and are usually not found in rocks containing primary quartz. A notable exception where feldspathoids and quartz-bearing rocks are found together is the Red Hill Syenite.[1]

Foid, a contraction of the term feldspathoid, is applied to any igneous rock containing up to 60% modal feldspathoid minerals. For example, a syenite with significant nepheline present can be termed a nepheline-bearing syenite or nepheline syenite, with the term nepheline replaceable by any foid mineral. Such terminology is used in the Streckeisen (QAPF) classification of igneous rocks.[2]

Feldspathoid minerals

References

Шаблон:Reflist


Шаблон:Silicate-mineral-stub

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  1. ↑ Шаблон:Cite web
  2. ↑ Шаблон:Cite book
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