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Answer 4: Beach sand has different colors because there are many different minerals that make up sand. In California, our sand usually looks white because it has minerals like quartz and pieces of shells that are made of calcium carbonate.
Basically, beach material is small pieces of rocks that have eroded and have been carried to the beach via the wind and water. The geology of the surrounding area determines the color of those rocks. This determines what material is available for a beach.In Hawaii, much of the rock there is black basalt making the sand black on some beaches. In other areas, coral or white quart may provide the sediment supply for white beaches.he geology of the surrounding area determines the color of those rocks. This determines what material is available for a beach. In Hawaii, much of the rock there is black basalt making the sand black on some beaches.