Bentonites: Geology, Mineralogy, Properties and Uses by Ralph E. Grim and Necip Güven (Eds.)

By Ralph E. Grim and Necip Güven (Eds.)

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One of these mossy aggregates is shown in Fig. 6. The tiny, lath-shaped crystallites in the same figure are probably cristobalite that was identified by X-ray diffraction in the bulk sample. Rocky Mountain and California areas Geological features. Bentonite deposits ranging in age from Triassic to Pleistocene are known in many of the Rocky Mountain states. ) bed of ash of latitic composition in the Pliocene Bidahochi Formation has altered to a calcium smectite. The alteration of the ash is not complete, and excellent shard fragments can be found in the white bentonite which is found generally in a series of beds of sand.

Basaltic pyroclastics are altered to the earth. Clays classed as sub-bentonites are reported by Arellano (1961) at Petlalcingo, Pueblo; Puente de Tierra, Michoacan; and S. Pedro and S. Pablo, Oaxaca. In each instance, the clays are altered pyroclastics generally acidic in composition. Clays classed as bentonites are reported by the same author at several other localities. At Guadalupe, Pueblo, bentonite occurs in a Tertiary sedimentary sequence of clays, sands, and felspathic conglomerates. The bentonite is said t o have formed by hydrothermal alteration of the conglomerate.

Clays classed as sub-bentonites are reported by Arellano (1961) at Petlalcingo, Pueblo; Puente de Tierra, Michoacan; and S. Pedro and S. Pablo, Oaxaca. In each instance, the clays are altered pyroclastics generally acidic in composition. Clays classed as bentonites are reported by the same author at several other localities. At Guadalupe, Pueblo, bentonite occurs in a Tertiary sedimentary sequence of clays, sands, and felspathic conglomerates. The bentonite is said t o have formed by hydrothermal alteration of the conglomerate.

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