The formation of bentonite as the product of the geologic alteration of volcanic glass or ash has been postulated by many writers (4, 12, 14, 16, 18). Their conclusions have been based on the following facts: Thin sections of bentonite show the same structure as particles of glassy material often associated with it; the presence of feldspar and the absence of appreciable amounts of quartz; the presence of nearby alkaline salt deposits, and the chemical composition of the bentonite clay itself. Conditions for the formation of this clay and the range of its stability, however, have been investigated but cursorily, and it, therefore, should be of considerable geologic interest to determine the conditions under which bentonite may be obtained from volcanic glass or ash. This paper presents the results of an investigation of the alteration of glass to bentonite under the influence of high temperatures and pressures.

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