Igneous rock consisting essentially of nepheline and augite
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]
^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.
^ abcChisholm 1911.
^Lindberg, Johan (January 19, 2011). "Ramsay, Wilhelm". Uppslagsverket Finland (in Swedish). Retrieved November 30, 2017.
^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)
Ijolite is an igneous rock consisting essentially of nepheline and augite. Ijolite is a rare rock type of considerable importance from a mineralogical...
breccia Icelandite – Igneous rock type Ignimbrite – Type of volcanic rock Ijolite – Igneous rock consisting essentially of nepheline and augite Kimberlite –...
Nepheline-syenite, Leucite-syenite, Nepheline-porphyry Essexite and Theralite Ijolite and Missourite Effusive type or Lavas Phonolite, Leucitophyre Tephrite...
the East African rift system. Associated igneous rocks typically include ijolite, melteigite, teschenite, lamprophyres, phonolite, foyaite, shonkinite,...
lava flows. Rare xenoliths of phonolite lava and ijolite were discovered in nephelinite lavas, with ijolite blocks found in phonolitic tuffs. The nephelinites...
Nilanjan (10 July 2011). "Occurrence of melanite garnet in syenite and ijolite–melteigite rocks of Samchampi–Samteran alkaline complex, Mikir Hills, Northeastern...
Finland, melanite bearing nepheline rocks have been found and described as ijolite, but the only other locality for melanite-leucite-syenite is Magnet Cove...
sphalerite form accessory components. The silicic lavas contain combeite, ijolites, melanite, nepheline, phlogopite, and pyroxene, as well as apatite, garnet...
within the complex include carbonatite, nepheline syenite, phonolite, and ijolite. In addition to the magnetite which forms both massive lodestone and crystals...
Fennoscandia (1900) and Postjotnian (1909). Ramsay also coined the term ijolite. Together with Jakob Sederholm, Ramsay was a student of Fredrik Johan Wiik...
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...
CHARACTERIZATION OF THEIR DEPOSITIONAL HISTORY AND HYDROGEOLOGIC FRAMEWORK". ijolite.geology.uiuc.edu. Retrieved 2017-04-27. Castiglia & Fawcett 2006, p. 115...