Ijolite Mineralogy, Composition & Formation - Britannica
Ijolite, intrusive igneous rock that is composed essentially of nepheline and an alkali pyroxene, usually aegirine-augite. It is the plutonic equivalent of the volcanic nephelinites. Typically, the pyroxene is well-crystallized and is surrounded by the …
霓霞岩 - 维基百科，自由的百科全书
霓霞岩（英語： Ijolite ）是一種火成岩，主要由霞石和輝石組成。 [1] 它是一種罕見的岩石類型，但從礦物學和岩石學的角度來看具有相當重要的意義。 霓霞岩產於芬蘭東部凱努地區和俄羅斯西北部白海沿岸的科拉半島。
Ijolite: Mineral information, data and localities. - mindat.org
Name: Named by Ramsay in 1891 for Ijola (Iivaara), Finland. A nephelinolite consisting of 30-70% nepheline with pyroxene. A series of plutonic rocks containing nepheline and 30% to 60% mafic minerals, generally clinopyroxene, and including minor titanite, apatite, and melanite; also, any rock of that series.
Ijolite
Ijolite, Augite, Nepheline. Podhorní hill, Mariánské Lázně, Cheb District, Karlovy Vary Region, Czech Republic. Coarse-grained ijolite - igneous rock consisting of clinopyroxene (black Ti-augite) and vitreous crystals of nepheline. Size 9×5 cm. Collection of author.
Petrology of ijolite series rocks from the Prairie Lake (Canada) and ...
2021年9月1日 · The ijolite series and malignites form the core and eastern part of the complex and are heterogeneous on a meter scale. The commonest members of the ijolite series found at Prairie Lake include: ijolite (pyroxene + nepheline); melteigite (pyroxene >70%); hollaite (calcite ijolite); and wollastonite apatite ijolite.
Ijolite - National MagLab
2015年11月13日 · Ijolite. Nepheline, which is the most common of a group of minerals called feldspathoids, is a primary component of several igneous rocks, including ijolite. Presence of nepheline is often an indication that the rock in which it is contained is alkali-rich. The crystalline rock ijolite is considered the plutonic analogue to olivine-poor ...
Metasomatic ijolite, glimmerite, silicocarbonatite, and antiskarn ...
2024年4月8日 · The chiefly anhydrous clinopyroxene–nepheline assemblage is consistent with the interpretation of Vasyukova and Williams-Jones that the ijolite rock family represent high temperature metasomatic reaction between early carbonatite melts and siliceous wall rocks. They are potentially antiskarns—rocks formed by leaching of chemical components ...
Petrology of ijolite series rocks from the Prairie Lake (Canada) and ...
This study reports the mineralogy and petrology, together with the major and trace element composition of pyroxenes, garnets and apatite from ijolite series rocks occurring at the Prairie Lake carbonatite complex, northwestern Ontario, with comparative data for ijolites from the Fen complex, Norway.
Petrology of ijolite series rocks from the Prairie Lake (Canada) and ...
2021年4月1日 · This proposed model for the formation of orbicular ijolite from Prairie Lake highlights the complexities of these rock types, and supports previous models of magma mixing during the later stages...
Alkaline rocks—undersaturated - SpringerLink
Ijolitic rocks are highly undersaturated in silica, and in their truly magmatic form (nephelinites) are alkaline ultramafic rocks. Although names such as nephelinite, leucitite, and melilitite are commonly applied, it should be remembered that clinopyroxene is the dominant mineral, and the rocks are truly pyroxenites.