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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.
(Coral skeleton is white because it is made of calcium carbonate, a mineral also found in chalk and human bones.) The green beach on the big island of Hawaii is green because the particular kind of rock that formed the sand (a type of cooled lava called basalt) has high amounts of a green mineral called olivine.