"pathway PLASTICS, INC."

Students discover the variety of rocks and minerals with this collection.

Fine crystalline, pure calcite.

Hematite-cemented quartz; orthoquartzite.

Chlorite-bearing.

Classic, very coarse-grained igneous texture.

Gray to brown mudstone with abundant silt.

Dark gray, with hornblende as the dominant mafic mineral.

Typical green-gray, fissile, clay-rich.

Well-cemented, medium-grained orthoquartzite.

Light gray, fine-grained, well-foliated, schistose.

Gray-to-brown basaltic, with over 50% vesicles.

Massive, chlorite-rich.

Brownish black, intermediate stage between peat and bituminous coal.

Coarse-grained plagioclase and pyroxene with some olivine.

Slaty cleavage; contains hematite.

Medium-grained with biotite.