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Ijolite
A rock classification type
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About Ijolite
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. Melteigite and jacupirangite are more mafic members of the series; urtite is a type rich in nepheline.
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. Melteigite and jacupirangite are more mafic members of the series; urtite is a type rich in nepheline.
Unique Identifiers
Mindat ID:
48393
Long-form identifier:
mindat:1:1:48393:5
Similar Names
| Iolite | A variety of Cordierite | (Mg,Fe)2Al3(AlSi5O18) |
| Ixolite | ||
| Jolite | A synonym of Cordierite |
Classification of Ijolite

Foidolite is in section 15 of the QAPF diagram.
Sub-divisions of Ijolite
Mineralogy of Ijolite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
| Pyroxene | A petrological term for Pyroxene Group. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Pronunciation of Ijolite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Age distribution
Recorded ages:
Phanerozoic : 462 Ma to 220 ± 1 Ma - based on 5 recorded ages.
Sample ages:
| Sample ID | Recorded age | Geologic Time | Dating method |
|---|---|---|---|
| 1 | 220 ± 1 Ma | Late/Upper Triassic | Sm-Nd |
| 2 | 373.3 ± 8.1 to 367.4 ± 4.9 Ma | Late/Upper Devonian | Rb-Sr |
| 3 | 418 to 374 Ma | Devonian | K-Ar |
| 4 | 462 Ma | Middle Ordovician | Sm-Nd isochron |
Synonyms of Ijolite
Common Associates
Associations Based on Photo Data:
Internet Links for Ijolite
mindat.org URL:
https://www.mindat.org/min-48393.html
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References for Ijolite
Reference List:
SAGGERSON, E. P., WILLIAMS, L. A. J. (1964) Ngurumanite from Southern Kenya and its Bearing on the Origin of Rocks in the Northern Tanganyika Alkaline District. Journal of Petrology, 5 (1) 40-81 doi:10.1093/petrology/5.1.40(as ngurumanite)
Localities for Ijolite
Showing 155 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.



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The
Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada