Reconnaissance-level geologic field studies were conducted in Forrest, Lamar, Jones, Covington, and Perry Counties, Mississippi, for the purpose of identifying and evaluating commercial and industrial applications of neogene lutite occurring in this area. Thirty-eight samples of lutite were collected, and grain-size distributions and quantitative clay mineralogy were determined in the laboratory for each sample. The location and distribution of lutite were also evaluated from water-well borehole geophysical data in Forrest and Lamar Counties. Both gra -size and mineralogical analyses confirmed previous studies conducted in different outcrop areas in which there was significant inhomogeneity among the samples investigated. Although silt and clay predominate, sand is an important component. The mineralogy of samples taken where weathering is minor consists of predominate smectite with subordinate and subequal amounts of kaolinite and illite. Weathered samples or samples containing appreciable sand contain subequal amounts of smectite and kaolinite and subordinate amounts of illite. On the basis of mineralogy and grain size, commercial uses of these materials may be limited to those uses in which adsorptive rather than firing properties are important owing to the significant amounts of smectite in the materials. The effective siting of a waste burial facility in this region will be a function of the material and rock properties of the lutite foundation material. The lutite permeability is expected to be low; however, the overall rock properties may not be ideal.