MICA SCHIST.Mica schist is a common metamorphic rock that is produced by regional metamorphism. The shiny look of schist is one of its key characteristics. The schist also has a nicely developed foliation. The word foliation comes from the Latin "folia" meaning leaves

MARBLE is metamorphosed limestone. Limestone is a sedimentary rock that is mainly composed of calcite, derived from the shells of living organisms like clams and snails. Marble can be produced by contact or regional metamorphism. Marble does not develop foliation like schist, because the calcite crystals are all about the same size. There is no way for them to line up. Marbles often contain other minerals, such as quartz, mica, and hematite.