Jasper

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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 cryptocrystalline (composed of very small fibers or rods). The red coloration of jasper usually indicates the presence of iron oxide.

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 »

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 »

Metamorphic rock

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… See more »

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Jasper

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