METAMORPHIC ROCK SPECIMEN

Rocks are simply defined as an aggregate of minerals. There three classifications Igneous Rocks formed  from cooled lava and magma associated with volcanic activity. Sedimentary Rocks formed from compacting sediments (pebbles, sand and clay) often below sea level. Metamorphic Rocks forms from preexisting rocks that get buried and remain in a solid state while immersed at various levels of heat and pressure.   

Metamorphic Rocks

Regional metamorphism is due to heat and pressure and produces foliation or cleavage in rocks where minerals have been aligned due to pressure and recrystallization.

Metamorphic Rocks: Foliated from regional metamorphism

Black Slate

Red Slate

Graphic Slate

Phyllite

Phyllite

Green Schist

Garnet Schist

Mica Schist

Garnet Schist

Folded Gneiss

Gneiss

Gneiss

Gneiss with dike intrustion

Migmatite

Migmatite

Metamorphic Rocks: Non foliated from contact metamorphism

Fine Grain Marble

Course Grain Marble

Fine Grain Marble

Fine Grain Quartzite

Course Grain Quartzite

Serpentinite

Metaconglomerate

Metabreccia

Anthracite (sometimes classified sedimentary)

Data: Pellant, Chris. Smithsonian Handbooks. Rocks and Minerals: The clearest recognition guide available. A Dorling Kindersley Book.

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