The Petrology of the Sedimentary Rocks a Description of the Sediments And Their
The Petrology of the Sedimentary Rocks a Description of the Sediments And Their
F H Frederick Henry Hatch
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Moreover, it frequently contains whitish patches of a soft aluminous material from which the iron oxide has been withdrawn by segregation. A local concentration of the latter produces nodular concretions of iron oxides, and similarly manganese when present is concentrated in nests or black botryoidal aggregates. Most laterites are traversed by numerous small 1 According to Holland a mixture of gibbsite and diaspore (JKec. Geol. Sui-vey, India, vol. Xxxii, p. 176). Lacroix (in Mineralogie de la ...France et de ses Colonies, p. 342) calls it a " rock" consisting of a mixture of various hydro-oxides of aluminium and iron with clay and sandy impurities. 2 Dr. Leigh Fermor suggests that true laterite should be defined as a residual material containing from 90 to loo per cent, of these " lateritic constituents. " Where the percentage of the latter is only from 50 to 90 per cent. , he suggests that the material should be described as "lithomargic laterite" when the diluting material is mainly clay, and as "quartzose laterite" when the diluting material is mainly quartz-sand, Geol.
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