The method of analysis herein described is being used in Illinois in an investigation of the mineral constituents of various soils, clays, and shales. The results are to be published later, but sufficient progress has already been made to warrant a statement of the technique developed.

The need for a method for the accurate identification and classification of mineral particles of colloidal size has long been a problem.1 Various methods have been used in attempting to solve the problem, but in investigating the argillaceous sediments of Illinois, it was found that even the most recently described techniques do not entirely suffice when the colloidal particles contain several minerals. Although this inadequacy has not been entirely surmounted for all argillaceous materials, it is felt that the technique herein described permits a more complete and more accurate mineral identification than has been possible heretofore. A clay and a shale from Illinois . . .

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