"pathway PLASTICS, INC."

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

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

Abundant small black phenocrysts in a gray to brown matrix.

Light gray, fine small clasts.

Dark gray with abundant gas pocket vesicles.

Gray andesite with phenocrysts of felspar and/or hornblende.

Pink and gray bands, with biotite; shows good foliation.

Dark, waxy, bitumin-rich.

Earthy, porous calcareous tufa.

Cemented glacial gravel.

Compact Plant Fiber Masses.

Black, soft; most widely mined.

Dark, coarse-grained, and composed chiefly of hornblende.

Samples of Intrusive and Extrusive Igneous Rocks

Foliated biotite, coarse, silvery gray with quartz-feldspar bands.

Without Glued-On Grains That Wear Off, Chart Stands up to Repeated use.