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Metamorphic Rocks

Metamorphic rocks

Metamorphic rocks

  • Exhibition Text

    • Metamorphic rocks form when sedimentary, igneous, or pre-existing metamorphic rocks are changed by heat, pressure, and chemically reactive waters. These rocks are identified by their minerals and texture.

      During metamorphism, new minerals grow, with different sizes, shapes, and orientations than those of the original minerals. The chemical composition of the original rock may also change, as some elements are carried away and others are added by the fluids flowing through the rocks.

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In This Section

Manhattan schist

Manhattan schist

Originally a shale, this schist now consists of dark, biotite-rich layers and finer-grained, light-colored layers made of gray quartz and white orthoclase.

Slate

Slate

This slate was also once a shale.

Gneiss

Gneiss

This rock was once a granite.

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