In Hawaii the term black sand beach has been used only for beaches dominated by grains of black volcanic glass. Lava flows entering the ocean chill and their glassy rinds shatter. Waves and currents may build a beach from the black grains of glass. There is no black sand beach on Oahu. There aren't even many light-gray beaches on Oahu.
Black sand is only present as distinct beaches on Hawaii (Big Island), at Punaluu (Kau district), at the west and east edges of the new lava delta from the current flank eruption (Puna), and in front of the recent flow that covered most of Kalapana and the famous former black-sand beach at Kaimu (Puna). Some additional Big Island beaches have a few per cent of glass (Hookena and Kealakekua (both South Kona); also small pockets at the shoreline and in storm beaches near Cape Kumukahi, South Point, and elsewhere along the Puna, Kau, South Kona, and North Kona coasts). Many others have a trace to perhaps 1% (Hilo, Waipio, etc.).
Some other beaches in the state have a per cent or so of glass (Hana, Kihei, and some lesser places, Maui; Kalaemilo (Kalaupapa) Molokai). Makaha and Sandy (Oahu) have a trace of glass (<1%).
Black sand is only present as distinct beaches on Hawaii (Big Island), at Punaluu (Kau district), at the west and east edges of the new lava delta from the current flank eruption (Puna), and in front of the recent flow that covered most of Kalapana and the famous former black-sand beach at Kaimu (Puna). Some additional Big Island beaches have a few per cent of glass (Hookena and Kealakekua (both South Kona); also small pockets at the shoreline and in storm beaches near Cape Kumukahi, South Point, and elsewhere along the Puna, Kau, South Kona, and North Kona coasts). Many others have a trace to perhaps 1% (Hilo, Waipio, etc.).
Some other beaches in the state have a per cent or so of glass (Hana, Kihei, and some lesser places, Maui; Kalaemilo (Kalaupapa) Molokai). Makaha and Sandy (Oahu) have a trace of glass (<1%).
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