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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 rocks are those formed by altering igneous, sedimentary, or other metamorphic rocks by heat and/or pressure. The heat and pressure cause changes in the minerals present, as well as rearranging the minerals in the rocks.Metamorphic rock names are based on grain size, organization of minerals into layers (foliation), and composition. Pennsylvania has gneiss, schist, phyllite, slate, marble, and quartzite.chist-A metamorphic rock dominated by coarse-grained mica arranged in layers. The layers tend to be wavy or bumpy, and separated by granular layers usually dominated by quartz. Large crystals of other minerals are common. One of these other minerals is garnet â dark red, rounded, pinhead-to pea-sized or larger.