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The prolonged rainfall and intermittent dry seasons in the highlands of north-central Puerto Rico are conducive to lateritic weathering. This laterization has resulted in a fluvial and insular shelf clay mineral assemblage that is dominated by kaolinite-group minerals and smectite. Minor amounts of illite, mixed layer illite-smectite, gibbsite, and trace amounts of chlorite and vermiculite are also present. Small amounts of hematite, goethite, quartz, and feldspar occur along with the layer silicates in the clay fraction. Variations in the clay-mineral assemblage are related to changes in the intensity and duration of the chemical weathering and in the composition of the underlying source rocks.

Clay mineralogy of sediments from the Rio Cibuco system and the adjacent rivers and insular shelf of north-central Puerto Rico