Mineral Content of a Latosolic Brown Forest Soil and a Humic Ferruginous Latosol of Hawaii1
- T. Tamura,
- M. L. Jackson and
- G. D. Sherman2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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