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Clay Mineralogy of Certain Soils of Colombia¹

ABSTRACT

Allophane was found to predominate in the soil derived from volcanic ash in the Colombian Andes. The allophane is transformed into halloysite. The soils of the superhumid tropical forests derived from marine deposits are high in kaolinite and low in gibbsite. Other clay minerals found in Colombian soils include vermiculite, montmorillonite, chlorite, and illite.

¹ Contribution from Purdue University Agr. Exp. Sta., Lafayette, Ind. Paper no. 3024. This material is based on a Ph.D. thesis submitted by the senior author. The authors wish to thank the Rockefeller Foundation and the Universidad de Caldas, Colombia, for financial support, and to C. I. Rich, Virginia Polytechnic Institute, and F. Hanke, Universidad de Caldas, Colombia, for technical assistance.

² Formerly graduate student, now with the Soil Department, Caldas University, Manizales, Colombia, Soil Scientist, and Professor of Agronomy, Purdue University, respectively.

Received for publication March 4, 1968. Accepted for publication June 7, 1968.