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Diatoms hidden inside a grain of sand, SEM

False-coloured scanning electron micrograph of three diatoms hidden inside a cavity of a grain of quartz sand. The sand was collected from a beach on the Florida gulf coast in the USA. Some of the sand at Florida's white gulf coast beaches is more than 99% quartz. Quartz or silica is a primary component of typical beach sand which forms when rock is weathered away (gradual wearing down of rock by …