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Mineral Content of a Latosolic Brown Forest Soil and a Humic Ferruginous Latosol of Hawaii¹

ABSTRACT

Mineralogical analysis for two soils representing the Latosolic Brown Forest and Humic Ferruginous Latosol groups were made using X-ray, thermal, and chemical techniques. In the A horizon of the Latosolic Brown Forest soil goethite (28%) was the predominant mineral; in the B horizon gibbsite (42%) predominated. Other minerals included hematite (15–25%), magnetite (0–10%), quartz (5–10%), and layer silicates (15–20%) in the A and B horizons, respectively. In the A₂ horizon of the Humic Ferruginous Latosol from the island of Maui hematite (48%) was dominant; in the B horizon gibbsite (31%), hematite (25%) and amorphous alumino silicate (22%) were present in nearly equal quantities. In the C horizon of Humic Ferruginous Latosol the gibbsite content (48%) was substantially higher than the iron oxides (14%). The A₂₂, B and C horizons of another Humic Ferruginous Latosol from the island of Kauai were also examined. The A₂₂ horizon was predominately hematite (45%) with appreciable anatase (15%) and ilmenite (15%). The B horizon contained both hematite (30%) and goethite (30%) as the dominant minerals; the C horizon contained kaolinite (35%) as the major mineral constituent.

¹ Joint contribution from the University of Wisconsin and the University of Hawaii. This work includes a portion of a thesis presented by the first author in partial fulfillment of the requirements for the Ph.D. degree, Univ. of Wisconsin, and was supported in part by the Vocational Rehabilitation Service of Hawaii and in part by the Research Committee through a grant for supplies of funds from the Wisconsin Alumni Research Foundation. Presented before Div. II, Soil Science Society of America, St. Paul, Minn. Nov. 11, 1954.

² Asst. Soil Scientist, Connecticut Agr. Expt. Sta., New Haven, Conn.; Professor of Soils, Univ. of Wisconsin; Head, Dept. of Soils and Agri. Chemistry, Univ. of Hawaii.

Received for publication October 22, 1954.