Metamorphic rocks are the most complex rock class, forming as they do by the compression and chemical alteration of other rocks, both sedimentary and igneous. This gallery starts with the rocks derived from sedimentary rocks, then presents those derived from igneous rocks.
 Metamorphic Pebble |  Slate |  Phyllite |  Phyllite Closeup |
 Mica Schist |  Mica Schist Hand Specimen, Manhattan |  Schist in Outcrop |  Schist in Sculpture |
 Gneiss |  New York Gneiss |  Garnet Gneiss |  Migmatitic Gneiss |
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