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Ijolite information


Ijolite (Oka Carbonatite Complex, Early Cretaceous, 124-125 Ma; Oka Niobium Mine, Quebec, Canada)

Ijolite is an igneous rock consisting essentially of nepheline and augite.[1] Ijolite is a rare rock type of considerable importance from a mineralogical and petrological standpoint. The word is derived from the first syllable of the Finnish words such as Iivaara, Iijoki · and Ii, all geographical names in Finland, and the Ancient Greek Xiflos, a stone. Ijolite occurs in various parts of the Kainuu region of eastern Finland and in the Kola Peninsula of northwest Russia on the shores of the White Sea.[2] Ijolite was first defined and named by Finnish geologist Wilhelm Ramsay.[3]

The pyroxene is morphic[clarify], yellow or green, and is surrounded by formless areas of nepheline. The accessory minerals are apatite, cancrinite, calcite, titanite and schorlomite, a dark-brown titaniferous variety of melanite-garnet. This rock is the plutonic and holo-crystalline analogue of the nephelinites -volcanic equivalent and nepheline-dolerites; it bears the same relation to them as the nepheline syenites have to the phonolites.[2]

A leucite-augite rock, resembling ijolite except in containing leucite in place of nepheline, is known to occur at Shonkin Creek, near Fort Benton, Montana, and was earlier called missourite,[2] but is now regarded as a variety of leucitite.[4]

  1. ^ Kresten, Peter; Troll, Valentin R. (2018). "The Alnö Carbonatite Complex, Central Sweden". GeoGuide. doi:10.1007/978-3-319-90224-1. ISBN 978-3-319-90223-4. ISSN 2364-6497. S2CID 135266142.
  2. ^ a b c Chisholm 1911.
  3. ^ Lindberg, Johan (January 19, 2011). "Ramsay, Wilhelm". Uppslagsverket Finland (in Swedish). Retrieved November 30, 2017.
  4. ^ Gupta, A.K and Yagi, K. (1980). Petrology and Genesis of Leucite-Bearing Rocks. Berlin: Springer-Verlag. ISBN 978-3-642-67552-2.{{cite book}}: CS1 maint: multiple names: authors list (link)

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Ijolite

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Ijolite is an igneous rock consisting essentially of nepheline and augite. Ijolite is a rare rock type of considerable importance from a mineralogical...

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List of rock types

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breccia Icelandite – Igneous rock type Ignimbrite – Type of volcanic rock Ijolite – Igneous rock consisting essentially of nepheline and augite Kimberlite –...

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Geochemistry

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Nepheline-syenite, Leucite-syenite, Nepheline-porphyry Essexite and Theralite Ijolite and Missourite Effusive type or Lavas Phonolite, Leucitophyre Tephrite...

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Carbonatite

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the East African rift system. Associated igneous rocks typically include ijolite, melteigite, teschenite, lamprophyres, phonolite, foyaite, shonkinite,...

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Sadiman volcano

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lava flows. Rare xenoliths of phonolite lava and ijolite were discovered in nephelinite lavas, with ijolite blocks found in phonolitic tuffs. The nephelinites...

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Garnet

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Nilanjan (10 July 2011). "Occurrence of melanite garnet in syenite and ijolite–melteigite rocks of Samchampi–Samteran alkaline complex, Mikir Hills, Northeastern...

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Borolanite

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Finland, melanite bearing nepheline rocks have been found and described as ijolite, but the only other locality for melanite-leucite-syenite is Magnet Cove...

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Ol Doinyo Lengai

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sphalerite form accessory components. The silicic lavas contain combeite, ijolites, melanite, nepheline, phlogopite, and pyroxene, as well as apatite, garnet...

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Magnet Cove igneous complex

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within the complex include carbonatite, nepheline syenite, phonolite, and ijolite. In addition to the magnetite which forms both massive lodestone and crystals...

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Wilhelm Ramsay

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Fennoscandia (1900) and Postjotnian (1909). Ramsay also coined the term ijolite. Together with Jakob Sederholm, Ramsay was a student of Fredrik Johan Wiik...

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Fen Complex

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varieties of carbonatite are present in the area as well as lamprophyre, ijolite and other highly alkalic rocks. It is the type locality for fenite, a metasomatic...

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Lake Palomas

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CHARACTERIZATION OF THEIR DEPOSITIONAL HISTORY AND HYDROGEOLOGIC FRAMEWORK". ijolite.geology.uiuc.edu. Retrieved 2017-04-27. Castiglia & Fawcett 2006, p. 115...

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Suzanne Mahlburg Kay

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Chronicle. Retrieved 2019-01-05. "Univ of Illinois Geology Colloquium". ijolite.geology.uiuc.edu. Retrieved 2019-01-05. Anonymous (2011-04-19). "AGU Fellows...

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