Why do some beaches have black sand instead of light-colored sand?
Quick Answer
Black sand usually comes from volcanic minerals or lava fragments weathered into tiny grains. Minerals like basalt, olivine, and magnetite give the sand its dark colour.
The Full Story
Black sand beaches often form near volcanic islands or active volcanic regions. When lava breaks down through weathering and erosion, it produces dark grains rich in basaltic material and heavy minerals such as magnetite. Waves and currents sort these grains onto the beach, sometimes creating striking black shorelines. Famous examples are found in Hawaii, Iceland, and the Canary Islands. The colour reflects the rock source, not the beach itself.
Key Facts
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