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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.
Metamorphic rock can be formed from virtually any parent rock (protolith) that has been subjected to heat and/or pressure, modifying its texture or mineral composition. Quartz sandstone, when metamorphosed, becomes the metamorphic rock 'quartzite'.1 person found this useful.Answered.o. Sandstone is sedimentary rock, where the individual grains of sand that compose the rock are visible without magnification.