"PARKWAY PLASTICS, INC."

Slaty cleavage; contains hematite.

White, mature, friable.

Gray, crystalline, massive, 'Alberene stone'.

Dark gray, composed mostly of pyroxene and olivine.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Mica group; cut sheets showing basal cleavages. Books and sheets in bulk pack.

Dark-green 'verde antique', containing some chlorite and calcite.

Classic, dark; from the Columbia Plateau.

Nearly pure, green crystalline forsterite.

White, fine, massive, opaque to slightly translucent.

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

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

Chlorite-mica with perfect slaty cleavage.

Students Work with Miniature Landfills in Hands-On Investigation

Brownish gray, kerogen-rich; commercial oil source.