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.
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A beach with real purple sand you ask? Yes, it is rare and you can find the purple sand beach at Pfeiffer Beach at Big Sur. Not only is the beach sand unique but the just offshore is the unique Keyhole Arch which is one of the photographed shots at Big Sur.
One of the main highlights of Pfeiffer Beach in Big Sur is the famous purple sand. Erosion of the cliffs above, which contain Manganese garnet rocks, is responsible for the incredible plum-like colors you see here.
Olivine SandOlivine is an igneous mineral formed from the crystallization of magma. At Papakolea, the olivine erodes out of an ancient volcanic cinder cone that encloses the semi-circular beach. Sand of almost exclusively olivine grains is very rare, and Papakolea is one of only four green sand beaches in the world.
Black sand beaches are located all over the world, from the sheer-sided caldera of Santorini in Greece to the geothermal hotspot of the Canary Islands, as well as mountainous Hawaii, lush Tahiti, Japan, and several islands in the Caribbean.