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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.
(Although continental sand is composed mostly of quartz, it also contains bits of feldspar and other rock fragments.) Tropical islands, such as the Hawaiian Islands, don't have a rich source of quartz, so the sand is different in those locations. The beach sand on tropical islands often looks white because it is made up of calcium carbonate, which comes from the shells and skeletons of reef-living marine organisms, including corals, mollusks and microorganisms called foraminifera.