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This article in SSSAJ

  1. Vol. 19 No. 4, p. 435-439
     
    Received: Oct 22, 1954


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doi:10.2136/sssaj1955.03615995001900040011x

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

  1. T. Tamura,
  2. M. L. Jackson and
  3. G. D. Sherman2

Abstract

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.

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