Sand grains from the eolian Kalahari sand formation in the Zambezi river valley above Victoria Falls in the Northern-Southern Rhodesia boundary region exhibit characteristically frosted surfaces due to the presence of minute scratches and pits. After transport over relatively short distances in the upper part of the river above the falls, the grains acquire a high surface polish, which is not appreciably modified during transport by saltation in turbulent waters below the falls.

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