Hawaiian beach deposits include both detrital and organic sand. Relative abundance of each type depends on recency of volcanism, intensity of weathering near source and vigor of growth of marine organisms. Size and sorting of particles depend on exposure to tradewind-driven waves, storms and reef configuration. Detrital grains are chiefly basalt but locally include much olivine or basalt glass. Organic grains are from Foraminifera, mollusks, red algae, echinoids, corals and Halimeda.

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