kids encyclopedia robot

Image: Sodalite-aegirine-albite pegmatite, Ice River Complex BC

Kids Encyclopedia Facts
Original image ‎(1,200 × 998 pixels, file size: 195 KB, MIME type: image/jpeg)

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)
Title: Sodalite-aegirine-albite pegmatite, Ice River Complex BC
Credit: Sodalite-aegirine-albite pegmatite (Ice River Complex, Early Mississippian, 356 Ma; southeastern British Columbia, Canada)
Author: James St. John
Usage Terms: Creative Commons Attribution 2.0
License: CC BY 2.0
License Link: http://creativecommons.org/licenses/by/2.0
Attribution Required?: Yes

The following page links to this image:

kids search engine
All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise.