A beach of ancient travelers
The seven kilometers of dazzlingly white sand at Whitehaven Beach did not form here. The local bedrock of the Whitsunday Islands, the result of volcanic activity that began around 110 million years ago, does not contain the quartz needed to produce such a beach. Instead, this sand is a deposit of ancient sand. Geologists theorize that for millions of years, prevailing sea currents flowing north along the Queensland coast moved the sand. This process, known as longshore drift, picked up quartz-rich sediments weathered from rocks far to the south and transported them northward.
The unique geography of Whitsunday Island, with its headlands and rocks, acted as a trap for this drifting sand. Over immense timescales, as ice ages came and went, sea levels rose and fell dramatically. About 10,000 years ago, at the end of the last glacial period, the sea rose to its current level, creating the beach we see today. During periods when the sand dunes were exposed, freshwater leached out impurities, leaving behind silica of exceptional purity. The beach is composed of 98% to 98.9% pure silica (SiO₂). It is a geological formation, an accumulation of foreign material shaped by geological history.