KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
White quartz pebbles on a beach. Pebbles are the smooth, eroded remains of larger rocks. Quartz (silicon dioxide) occurs in many rocks, especially igneous rocks such as granite and quartzite. Photographed on Whidbey Island in the San Juan Islands, Washington State, USA.
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