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Figure 14. Scanning-electron microscope photomicrograph of a fragment of pyrite infilling plant cells in coal. Bright areas are pyrite, gray areas are organic cell walls, and black area is epoxy mounting media. Sample is from a bituminous coal from Pennsylvania. Magnification approximately ×1000. Modified from a photomicrograph by L.F. Ruppert (U.S. Geological Survey). |
U.S. Department of the Interior, U.S. Geological Survey
URL: https://
pubsdata.usgs.gov
/pubs/circ/c1143/html/fig14.html
For more information, contact Stanley Schweinfurth
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