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South shore of Big Island, Hawaii, Black Sand Beach
Provenance:
volcanic sand of recent basaltic lava: along Hawaii's south coast, basaltic lava, up to 1100 deg C
hot, is shock-cooled upon contact with the sea water. Glassy beads and highly porous basaltic
"spatter" form which are quickly ground up into shards by shoreline surf and swash. The black beach
becomes extremely hot under the morning sunProvenance of the sand, description of sedimentation route....
Composition:
Composition of the sand, mineralogy, ecc.
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