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Part of the rock formation called Devil's Oven, at Devils Hopyard State Park. This particular set of rocks has undergone differential weathering - some parts of the rock weather faster than others - which has left caves in places. Local folklore has it that during the American Revolution, these caves served as hiding...
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Le Conquet micaschists in the coastal section between Pointe St-Mathieu and Le conquet (Brittany, France).
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Part of the northern part of Devils Hopyard State Park: Eightmile River falls here over schist and gneiss. Weathering has formed circular "potholes" in the rock helps lend the name to the park (local legend is that the devil's tail made the holes).
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This is my first thin-section gigapan. I've been wanting to stitch and upload one of these on Gigapan for a long time. A `thin-section' is a slice of rock that's been cut and ground until it's a mere 30 microns thick. (That's 0.03mm, or 0.0013 inch.) Thin sections are used by geologists to examine rocks in microscop...
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Field of view is approximatly 15 by 20 mm. Image is a garnet-chloritoid schist from Jamaica, Vermont. Large porphyroblast of garnet contains gently curved inclusion trail of chloritoid. Pleochroic chloritoid is blue, green, and yellow. Well developed crenulation cleavage in right third and lower left corner of image. ...
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Muscovite schist (metamorphosed Harpers Formation?) from Throroughfare Gap / Bull Run Mountain, Virginia, bearing euhedral porphyroblasts of magnetite. Sample measures 8.5 by 2.5 cm. Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro...
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Field of view is approximately 15 by 20 mm. Crossed polarized light. Thin section of a chloritoid (shades of gray) schist. Muscovite is brightly colored and chlorite is brown. Zonal crenulation cleavage is nearly vertical. Taken with the automated thin section imaging system at Williams College
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Sample 4012. Plagioclase contains abundant inclusions of graphite. Matrix is graphite-poor. Image is approximately 8 by 10 mm. Taken with the automated thin section imaging system at Williams College.
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Gravel in gravel road just off of Rockwell Church Road in Winder, GA.
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Field of view is approximately 15 by 20 mm. Plane polarized light. Thin section of a chloritoid (pleochroic blue, green, and yellow) schist. Muscovite is nearly white and chlorite is brown. Zonal crenulation cleavage is nearly vertical. Taken with the automated thin section imaging system at Williams College
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