U.S. Geological Survey: Science for a Changing World - USGS visiaul identifier and link to main Web site at http://www.usgs.gov/

Scanning-electron microscope photomicrograph of a fragment of pyrite infilling plant cells in coal

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
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