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Explanation for Plate 11.
Plate 11--Pyrite in coal. Photomicrographs of polished sections taken with the reflecting microscope using
vertically incident light. A, White material is pyrite; black material is calcite and coal. Pyrite has replaced
calcite which originally filled cell cavities and has partially replaced coal (Mineral coal, X 95). B, Pyritic
replacement of calcite at higher magnification (Mineral coal, X 375). C, Coalescence of pyrite where it
replaces calcite and coal (Mineral coal, X 95). D, Pyritic replacement of calcite and coal. Plant cells have
been somewhat deformed (Mineral coal, X 95).
Petrographic Study of Southeastern Kansas Coals, by William W. Hambleton
Originally published in 1953 as Kansas Geological Survey Bulletin 102, Part 1.
http://www.kgs.ku.edu/Publications/Bulletins/102_1/index.html
Nov. 2005
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