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This sand is from the Big Sur coast of California, with many metamorphic rocks created near an ancient subduction zone. The sand on the right is 100% composed on shells, coral skeleton, and other biological precipitates.
exists and is an alternate of . The difference lies in the degree of metamorphism. Metamorphism is the solid state recrystallisation of minerals. Both rocks are metamorphosed by regional metamorphism (directed pressure), however schist is metamorphosed more than slate. Therefore Slate is only a low grade metamorphic rock whereas schist is a medium grade metamorphic rock (gneiss is high grade).