"Freeze-Dried Specimens"

Pale pink felsite, with small sanidine phenocrysts.

Gray to white, coarse crystalline, carbonate rock.

Dark gray with abundant gas pocket vesicles.

Gray and poorly sorted, with a gritty texture.

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

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

Volcanic glass with snowflakes embedded throughout.

Lustrous, black 'hard coal'.

Shows porphyritic texture in a fine dark matrix abundant large feldspar phenocrysts. Hand specimen.

Gray, fine, friable, with abundant small sanidine crystal fragments.