Earth: an introduction to physical geology, 10e (tarbuck/lutgens/tasa) 8. 1 multiple-choice questions: which of the following forms at the highest grade of regional metamorphism, hornfels, schist, slate, phyllite. Diff: 1: what platy, parallel, mineral grains are the most visual aspect of foliated metamorphic rocks, micas, feldspars, carbonates, quartz. Diff: 1: which low-grade metamorphic rock, composed of extremely fine-sized mica and other mineral grains, typically exhibits well-developed rock cleavage, schist, hornfels, quartzite, slate. Match the rock with the appropriate description: hornfels, ________ forms by contact metamorphism of mudstones and shales. 1: ________ foliated, fine-grained metamorphic rock formed from mudstone and shale. Diff: 1: ________ nonfoliated metamorphic rock consisting mostly of calcite. Diff: 1: ________ coarse-grained, metamorphic rock with alternating bands or stringers of light and dark minerals. Diff: 1: ________ is thought to form by partial melting and in situ crystallization of the melted portion, magmatite, magnetite, migmatite, megatite.