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Summary
| Description |
Sodalite-aegirine-albite pegmatite (field of view ~7.1 cm across) from the Ice River Complex of British Columbia, Canada. Blue = sodalite Very dark green = aegirine pyroxene Whitish = albite/sodium plagioclase feldspar Here’s an unusual rock that represents a cavity-filling in a pegmatitic syenite. The syenite host rock is dominated by large, whitish albite crystals (= sodium plagioclase feldspar, NaAlSi3O8) (see left & right edges of photo). The cavity fill has nice, large, bluish sodalite crystals (= sodium chloro-aluminosilicate, Na8(AlSiO4)6Cl2)). Surrounding each sodalite is a radiating spray of very dark green needles of aegirine pyroxene (= sodium iron silicate, NaFeSi2O6). The rock comes from southeastern British Columbia’s Ice River Complex. The Ice River is an 18-kilometer long, 29-square kilometer, backward J-shaped alkaline igneous intrusion emplaced in Cambro-Ordovician passive-margin limestones and shales. Age: ~356 million years (Tournaisian Stage, Early Mississippian) |
| Date | |
| Source | Sodalite-aegirine-albite pegmatite (Ice River Complex, Early Mississippian, 356 Ma; southeastern British Columbia, Canada) |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15003852812. It was reviewed on 24 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:12, 24 August 2014 | | 1,200 × 998 (195 KB) | Tillman | Transferred from Flickr via Flickr2commons |
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