On the coast of California, near San Francisco, there is a beach strip where small red, green, yellow and dark fragments blend into the gravel. Rodeo Beach is not covered by real glass: much of this colorful effect comes from natural sinuses of silex, cornalin, sandstone and basalt, rounded and polished continuously by the action of the...
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On the coast of California, near San Francisco, there is a beach strip where small red, green, yellow and dark fragments blend into the gravel. Rodeo Beach is not covered by real glass: much of this colorful effect comes from natural sinuses of silex, cornalin, sandstone and basalt, rounded and polished continuously by the action of the...