Types of Occurrence of Nontronite and Nontronite-like Minerals in Soils
Date
1962-01
Authors
Sherman, G.D.
Ikawa, Haruyoshi
Uehara, Goro
Okazaki, Ernest
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University of Hawai'i Press
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Abstract
Nontronite, the iron-rich dioctahedral mineral
of the montmorillonite group, is rarely
found in soils. A number of montmorillonite
clays having a high content of iron oxide have
been found in subsoils. These occurrences are
located at Toowoomba, Queensland, Australia;
Waipata, South Island, New Zealand; Molumolu,
Fiji; and at a number of sites in the Hawaiian
Islands. These clays occur as relatively
pure mineral aggregates and therefore are well
segregated from their matrix. The type of occurrence
provided material of homogeneous
chemical and mineral compositions. The iron
oxide content of these clays ranged from 9 to
32 per cent and indicates a wide range of iron
substitution in the octahedral position. These
clays occur under a wide range of climatic conditions,
as evidenced by rainfall variation of 13
to 120 inches per year. Likewise, they occur in
both early and late stages of weathering and,
because of that, they occur in different mineral
associations of primary minerals, other 2: 1
clays, kaolin, iron oxides, and bauxite.
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Sherman GD, Ikawa H, Uehara G, Okazaki E. 1962. Types of occurrence of nontronite and nontronite-like minerals in soils. Pac Sci 16(1): 57-62.
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