Purple sand

Purple beaches are a phenomenon caused by the presence of a large amounts of almandine-pyrope garnet. or other purple minerals like manganese or rose quartz that have accumulated in the local sediment. These purple beaches are primarily found in the western Canadian Shield region or the northern continental United States; often in proximity to a major river systems with coarse sediment, a glacial sediment source, or input from glacial or para-glacial sediment.