Siesta Beach is a beach located on Siesta Key in the U.S. state of Florida. Unlike beaches elsewhere that are made up mostly of pulverized coral, Siesta Beach's sand is 99% quartz, most of which comes from the Appalachian Mountains. Over time the feldspar and mica have been removed from the rock, leaving almost pure quartz. Even on the hotte…Siesta Beach is a beach located on Siesta Key in the U.S. state of Florida. Unlike beaches elsewhere that are made up mostly of pulverized coral, Siesta Beach's sand is 99% quartz, most of which comes from the Appalachian Mountains. Over time the feldspar and mica have been removed from the rock, leaving almost pure quartz. Even on the hottest days, the sand is so reflective that it feels cool underfoot. According to Harvard University geologists, it's estimated that the sand on Siesta Beach and Crescent Beach on Siesta Key is millions of years old, having its origin in the Appalachians and flowing down the rivers from the mountains until it eventually was deposited on the shores of Siesta Key.
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