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DISTRIBUTION OF KAOLIN AND BAUXITE OF THE COASTAL PLAIN OF GEORGIA 1
Author(s) -
Stull R. T.
Publication year - 1924
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1924.tb18252.x
Subject(s) - bauxite , geology , sedimentary rock , silicic , mineralogy , weathering , silicic acid , clay minerals , geochemistry , materials science , metallurgy , volcano , oceanography
The commercial deposits of sedimentary kaolins and bauxites occur in the Lower Cretaceous of the Coastal Plain. The kaolins vary from “hard clay” to flint clay on one hand to “soft clay” on the other. The hardness of the clays apparently depends on the free silicic acid content. They are difficult to slake and filter‐press. The soft clays are washed for the filler and ceramic trades. Evidently the clays were originally hard clays, the soft clays originating from the hard clays by leaching out of the free silicic acid. The bauxites were evidently derived from soft kaolin through decomposition and removal of the silica. The bauxites occur as lenses embedded in larger lenses of kaolin. These bauxites were probably derived from soft clay by laterization. A proposed classification of the sedimentary kaolins and bauxites is given.