"The Mystery of Lyle and Louise"

Typical green-gray, fissile, clay-rich.

Chlorite-mica with perfect slaty cleavage.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

Chlorite-bearing.

Lustrous, black 'hard coal'.

Black, soft; most widely mined.

Brownish black, intermediate stage between peat and bituminous coal.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

1 pound of black sand packaged in a heat-sealed bag.