"Freeze-Dried Specimens"

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Brownish black, intermediate stage between peat and bituminous coal.

Fightly cemented, medium-to-coarse quartz grains.

Chlorite-mica with perfect slaty cleavage.

Gray to brown mudstone with abundant silt.

Pale pink felsite, with small sanidine phenocrysts.

Dark gray with abundant gas pocket vesicles.

Gray to buff, with numerous ooliths and fossil fragments.

Volcanic glass with snowflakes embedded throughout.

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

Silvery, paragranite and muscovite-rich with medium garnet crystals.

Black, soft; most widely mined.

Typical green-gray, fissile, clay-rich.

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

Light gray, fine small clasts.

Dense and massive.