A sample of beach sand from a relatively inaccessible section of the Pacific Coast of Mexico is described. The mechanical analysis shows 86.82 per cent of the material in the [1]/[8] mm grade size. The heavy mineral content is unusually high with staurolite, hornblende and hypersthene accounting for 65 per cent of the total residue. On the basis of mineral composition, the sands are believed to have been derived from igneous and metamorphic rocks in the Sierra Madre del Sur and moved northward along the coast by shore currents.

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