At temperatures of around 2,000°C, sand turns into glass. Sometimes, in the event of a lightning strike (or, even rarer, a meteor hit) the resulting heat can fuse the grains together and produce glass entirely naturally. This is not what happened at California’s Glass Beach.
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Glass Beach is a beach in MacKerricher State Park near Fort Bragg
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Glass Beach – Fort Bragg, California - Atlas Obscura
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Glass Beach – Fort Bragg, California - Atlas Obscura
Tourists flock to former rubbish dump that's transformed into
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Glass Beach, The Beach that was Created by A Pile of Garbage Glass
Glass Beach – Fort Bragg, California - Atlas Obscura