File:Eudialytic metasyenite Temiscamingue County, sw Quebec.JPG
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| Description |
Eudialytic metasyenite (6.8 cm across) from the Precambrian of Quebec, Canada. Eudialyte is an attractive, rare, pinkish-red silicate mineral having a moderately complex chemistry. Eudialyte is a sodium-calcium-cesium-iron-manganese-yttrium-zirconium hydroxychlorosilicate (Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2). The rock shown here has a significant eudialyte component, along with sodic plagioclase feldspar (white) and arfvedsonite amphibole (black). It is a eudialytic peralkaline syenite (or metasyenite, as the rocks on the outcrop scale have a weakly developed, coarse-scale foliation). Locality - apparently the “rare-earth occurrence” locality of Currie & Van Breemen (1996 - Canadian Mineralogist 34: 435-451) and Currie (1998 - Geological Survey of Canada Current Research 1998-C: 167-172), near the Kipawa River between Lake Sheffield and Lake Sairs, Villedieu Township, south-central Témiscamingué County, southwestern Quebec, southeastern Canada. Geologic origin - published information indicates that the eudialyte is metasomatic in origin (= formed by the significant addition of chemicals to pre-existing rocks), and dates to about 994 million years (late Mesoproterozoic). The host syenite rock is mid-Mesoproterozoic in age (~1.24 billion years). It forms part of the Kipawa Syenite Complex in the Kipawa Syncline area of the Grenville Province, near the Grenville Province-Superior Province boundary. |
| Date | |
| Source | Eudialytic metasyenite (Kipawa Syenite Complex, Mesoproterozoic, 994 Ma; near the Kipawa River, Villedieu Township, Temiscamingue County, sw Quebec, Canada) 1 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15002798925. It was reviewed on 23 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 23:58, 22 August 2014 | | 1,354 × 1,027 (263 KB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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