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The lake's clear, turquoise waters are fed by glacial meltwater, giving it a distinctive blue-green color. The pebbles found in Glacier Lake McDonald have a variety of colors, ranging from white to black, with shades of grey, pink, and green in between. These pebbles have been formed over thousands of years by the erosion of the surrounding mountains and glaciers, which has created a diverse mixture of sedimentary rocks. The colors of the pebbles are derived from the mineral content of the rocks they are formed from.
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