Papakolea (green sand) Beach on the Big Island, Hawaii
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Green Sand Beach gets is name from the green glassy crystals (Olivine) that make up most of the sand on this beach. They are washed out of a 49.000 year old cinder cone that spewed olivine-rich lava, and that still is visible on the east side of the bay.
For more information on green sand beach have a look at the Hawaii Green Sand Beach Guide of www.lovebigisland.com