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Gneiss is coarsely foliated in bands. The
bands can be straight, pancake-like, or wavy. The bands differ in
composition and are coarse grained making them easy to identify. Many of
the light-colored bands are composed of either quartz or feldspar. The
dark bands belong to the augite/hornblende groups.
Schist is finely foliated forming thin
parallel bands. The individual minerals are visible but are usually
platy or rod-like. Some minerals are larger within the foliated
minerals, and these can include garnet, pyroxene or feldspars. Schist
looks like it is composed of "glitter."
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Gneiss
Schist
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