Abstract
Glauconitic mica from lacustrine sediments in pluvial Lake Mound, Lynn and Terry counties, Texas is identified by x-ray diffraction, optical measurements, differential thermal analysis and chemical analysis. Glauconitic mica occurs in Lake Mound as pellets, streaks, or disseminations in clastic sands and lacustrine dolomites with montmorillonite, illite and mixed layer clays. There is no source of detrital glauconite or glauconitic mica in the vicinity. The glauconitic mica is authigenic, formed by fixation of iron and potassium in clay mineral lattices in the lacustrine sediments.
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