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Photomicrograph of pyrite filling fractures in the Upper Freeport coal bed in Pennsylvania
Figure 11. Photomicrograph of pyrite (yellow) filling fractures in the Upper Freeport coal bed in Pennsylvania. Magnification approximately ×4000. From Atlas of Coal Geology, American Association of Petroleum Geologists (AAPG) Studies in Geology No. 45 (Papp and others, 1998); AAPG copyright 1998, reprinted by permission of the AAPG, whose permission is required for further use.


U.S. Department of the Interior, U.S. Geological Survey
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