"pathway PLASTICS, INC."

Coarse-grained plagioclase and pyroxene with some olivine.

Medium-grained with biotite.

Pink/gray coarse carbonate rock.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Pale pink felsite, with small sanidine phenocrysts.

Dark gray, composed mostly of pyroxene and olivine.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

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

Brownish gray, kerogen-rich; commercial oil source.

Lustrous, black 'hard coal'.

Small, rounded pebbles and tightly cemented granules.

Glassy; most specimens float in water.

Gray to white, coarse crystalline, carbonate rock.

Classic, dark; from the Columbia Plateau.

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

Fine, common limestone; massive, and will fizzle with HCl.