which of the following is not true? group of answer choices foliated metamorphic rocks are composed largely of equidimensional grains of minerals such as quartz and calcite. high-grade, regional metamorphism produces significant and recognizable changes in the textures and mineral compositions of rocks. muscovite, biotite, and chlorite are common minerals found in phyllites and schists. slate and schist are both derived by metamorphism of shales and mudstones.