Metamorphic rock

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Metamorphic, meht uh MAWR fihk, rock is one of the three main types of rock in the earth's crust. It forms from the other two main types, igneous and sedimentary. For example, marble is a metamorphic rock that forms from the sedimentary rock limestone. Schist and slate are metamorphic rocks that come from shale.

Slate

Slate is a fine-grained rock that can easily be split into thin slabs. It consists mainly of grains of mica, chlorite, and quartz and may also have… See more »

Jasper

Jasper is the name of a dark red variety of chalcedony. Chalcedony is the most common member of a group of quartz minerals that are… See more »

Gneiss

Gneiss, nys, is a banded, coarse-grained rock. In most forms of gneiss, the banding results from the arrangement of dark- and light-colored… See more »

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Metamorphic rock

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