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PYRITE MORPHOLOGY IN LIGNITIC COAL AND ASSOCIATED STRATA OF EAST TEXAS

Scanning electron micrographs of pyrite separted from lignitic coal show the occurence of several morphological forms of simple and comopound particles. Porous and nonporous particles of pyrite crystals are sometimes scattered on the surfaces of grains. Framboids of individual pyrite crystals are porous and weekly aggregated into spheroids that are commonly 20 to 50 µ in diameter. Polyframboids are made up of framboids cemented together into irregular aggregates. Pyrite microcrystals are 0.25 to 1.5 µ across and, thus, have a large, exposed surface area. These findings suggest that sulfide oxidation and acidity formation will proceed at a relatively rapid rate when pyritic mine spoil is exposed to weathering forces.