sand - coral and basalt - set of five tubes of sand derived from coral and basalt
Sand is derived from whatever material is locally available. Beaches are uncommon on the seacliff-ringed Island of Hawaii. Occasional small coves have sand derived primarily from basalt unless there is a coral reef offshore. This sand was collected from a small cove near South Point, Hawaii, where a local concentration of cobbles of basalt and coral was the source material for this sand. The sand is primarily coral and basalt, giving it a salt and pepper look, with occasional small shell fragments adding variety to the mix.
Hawaii's white sand beaches at Waikiki were initially an import, from California. In the 1920s and 1930s sand was barged from Long Beach, though the import of California sand was abandoned in the 1970s and the beach is now maintained with locally dredges sand composed of coral and shell fragments. A locally famous black sand beach occupies a cove southwest of Hilo, where the sand is entirely basalt. At Mahana Bay, near South Point, the greenish sand is composed of grains of olivine that weather out of the basalt.
Set of five tubes, 16 ml each, optically clear polystyrene with screw caps. The plastic tubes are practical in a classroom and are somewhat student resistant, though a cap can be unscrewed. Good for student examination. When this sand is gone, it's gone. A recent law prohibits removal of sand from Hawaii's beaches.
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