"Freeze-Dried Specimens"

Gray, fine-grained, massive contact rock.

Gray to buff, with numerous ooliths and fossil fragments.

Volcanic glass with snowflakes embedded throughout.

Pale pink felsite, with small sanidine phenocrysts.

Typical green-gray, fissile, clay-rich.

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

Lustrous, black 'hard coal'.

Black, soft; most widely mined.

Slaty cleavage; contains hematite.

Red-brown to gray, coarse-grained, containing feldspar and mica.