"Freeze-Dried Specimens"

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

Dark gray with abundant gas pocket vesicles.

Gray and poorly sorted, with a gritty texture.

Volcanic glass with snowflakes embedded throughout.

Massive, chlorite-rich.

Pale pink felsite, with small sanidine phenocrysts.

Black, soft; most widely mined.

Slaty cleavage; contains hematite.

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

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