Mixed carbonate-silicate sand

Sand is usually composed of mineral grains but especially marine samples contain often biogenic fragments as well. There are many occurrences of either pure or almost pure mineral and biogenic sands but sometimes these two are mixed up in all proportions to form an interesting hybrid carbonate-silicate sand type.

Mixture of yellow and white biogenic and black volcanic sand grains. Jungmun Beach, Jeju-do island, South Korea.

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