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The snowflake graphites are a very rare surface morphology that appear to have arisen from a later generation of graphite grown in a dendrite pattern on an earlier grown hexagonal graphite crystal surface. The color images come from the interference of light in a optical microscopy technique called differential interference contrast, which is used to enhance surface topography. These unusual crystals occurred in a single sample of marble from a large quarry near Harrisville, New York.
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