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The Permian Phosphoria Formation of southeastern Idaho is one of the largest phosphate producing deposits in the world. Despite the economic significance of this Formation, the fine-grained nature of this phosphorite deposit has discouraged detailed mineralogical characterization and quantification studies. Recently, the issue of naturally occurring Se and other potentially hazardous trace elements from mine wastes has drawn . increased attention to this Formation, and motivated more extensive study. Part of this effort has focused on conducting a more detailed geological, including a mineralogical, characterization of the area. Past research has identified the presence of major minerals in the formation, including carbonate-fluorapatite, quartz, and dolomite, along with a variety of sheet t '<. silicates and feldspar phases. Minor phases such as pyrite and sphalerite have also been identified in the deposit and have been suggested as possible sites for Se residence. This study used powder X-ray diffraction (XRD), with Rietveld quantification software, to characterize the 67 samples collected from two stratigraphic sections measured by the U.S. Geological Survey at the Enoch Valley mine in the Meade Peak Member of the Phosphoria Formation. This analysis shows extensive variability of carbonate substitution into the fluorapatilc structure, determined by measurements of the apatite a-cell dimension. The analysis produced quantitative mineralogical results for the 67 samples, showing some patterns of correlation between mineralogy and the

u.s. geological survey open file report/open-file report

Preliminary mineralogical characterization of weathered and less-weathered strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Measured sections A and B, central part of Rasmussen Ridge, Caribou County, Idaho