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Department of Mineral Sciences

Izalco Volcano

Petrographic Reference Collections

Petrographic Reference

Graphic granite from Knickelā€™s feldspar quarry, Bedford, Westchester County, New York. This specimen was originally in the Petrographic Collection of the United States Geological Survey (2¼ x 2¾ x 1") [NMNH 111123-1767].

Photography by Ken Larsen.

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