Clays and Clay Minerals. Proceedings of the Eighth National by Ada Swineford

By Ada Swineford

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Additional info for Clays and Clay Minerals. Proceedings of the Eighth National Conference on Clays and Clay Minerals

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White, J . L. (1956) Reactions of molten salts with layer-lattice silicates: Clays and Clay Minerals, Natl Acad. —Natl. Res. Council pub. 454, pp. 133-146. GEOLOGY, MINERALOGY, AND GENESIS OF SELECTED FIRECLAYS FROM LATAH COUNTY, IDAHO by 1 HERMAN PONDER AND W. D. KELLER University of Missouri, Columbia, Missouri ABSTRACT Fireclay deposits occur in Latah County, Idaho, as residual weathered products, and as lacustrine sediments comprising part of the Miocene Latah formation. The residual deposits were developed upon granitic (granodioritic, gneissic) masses by surface weathering.

It is described generally as being residual clay from granite, but in some places a gneissic structure is displayed. The original granitic knob has been altered here to depths of at least 100 ft, as has been shown by drilling. Moreover, the altered material has been protected from erosion by a basalt cap which ranges in thickness from 1 to 20 ft. Unaltered rock is not exposed in the Benson deposit, but a relatively unaltered counterpart of the deposit was collected from the nearest exposure, a creek bed approximately one-half mile southwest of the Benson Pit, where the basalt cap has been eroded and relatively fresh gneissic rock is exposed.

Free lithium and other salts were removed by dialysis in a small-batch condenser-type dialyzer constructed by placing dialysis tubing within a condenser jacket. About 100 ml of suspension was placed in the central dialysis tubing and mechanically agitated with a spiral glass rod stirrer. De-ionized water in the jacket was replaced thoroughly every 15 min 4 42 EIGHTH NATIONAL CONFERENCE ON CLAYS AND CLAY MINERALS by a timer-controlled solenoid valve. The concentration of free salts was measured by flame photometric determination of lithium in the supernatant liquid of a centrifuged aliquot of suspension.

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