Geological Thin Sections
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This is a gallery of petrographic thin sections.
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Thin section of graphitic schist from Pownal, Vermont. Field of view is 16 by 34 mm. Road-cut along Rt. 7 where graphitic schist surrounds marble sliver.
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A thin section containing a chlorite mineralized fault. (There are actually two faults; a hard to see one along one edge,and a clearer one in the middle.)
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Sample 4063B in plane polarized light.
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Sample 4065. Field of view is approximately 15 by 20 mm. Variable graphite concentration. Taken with the automated imaging system at Williams College.
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Sample 4062A. Highly variable graphite concentration by layer. Some plagioclase porphyroblasts contain abundant zoned graphite inclusions. Plane polarized light. Taken with the automated imaging system at Williams College.
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- Thin Section of deformed Cheshire Quartzite from the Rattlesnake Thrust, Pownal, Vermont by Paul Karabinos
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Sample 3130A. Quartz, plagioclase, microcline, muscovite grains deformed in a fault zone. Field of view is approximately 5 by 7 mm. Created with the automated thin section imaging system at Williams College.
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- Thin Section Photograph of Schist from Mount Greylock, Massachusetts. Graphite only present as inclusions in plagioclase. by Paul Karabinos
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Sampel 4010. Crossed Polars. Graphite poor matrix, but high concentration of graphite where it was overgrown and included by plagioclase. Photo taken with the automated imaging system at Williams College.
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Sample 4062A. Highly variable graphite concentration by layer. Some plagioclase porphyroblasts contain abundant zoned graphite inclusions. Crossed polars. Taken with the automated imaging system at Williams College.
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Sample 4063B. Field of view is approximately 15 by 20 mm.
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2945i crossed polars
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