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Cacoxenite having the composition (A14.0Fe22.507.~(OH)14.3(PO4)17(H20)23.7)" 50.3H20 was identified in a bed of mature quartz sand in the Miocene Calvert Formation near Popes Creek, Maryland. This is the first reported occurrence of this mineral in Atlantic Coastal Plain sediments north of Florida. The cacoxenite occurs as silt-size to sand-size grains, both as irregularly shaped aggregates and as radiating arrays of delicate acicular crystals. The presence of discrete cores and overgrowths indoi:10.1346/ccmn.1988.0360506 fatcat:mm4nxeadanevlekf4zxsj7zuii