Investigation of the clay minerals in a gumbotil associated with the Mahaska soil series in Keokuk County, Iowa, indicates that the principal clay mineral is a dioctahedral calcium montmorillonite. Other clay minerals present in this gumbotil are kaolinite and mica, although they are in much smaller percentages. The investigation also pointed out difficulties involved in analyzing this type of soil by standard X-ray procedures and the complications introduced in the analysis of soil samples with high iron content utilizing standard accepted diffraction techniques.
Proceedings of the Iowa Academy of Science
©1964 Iowa Academy of Science, Inc.
Kelley, Wilbourne A. III and Ho, Clara
"Clay Mineralogy of a Gumbotil,"
Proceedings of the Iowa Academy of Science, 71(1), 342-349.
Available at: https://scholarworks.uni.edu/pias/vol71/iss1/51