"PARKWAY PLASTICS, INC."

Light gray, compact, hard, opaque, microcrystalline silica mineral.

Two or more magnifiers may be snapped together to produce increased magnification and to illustrate the principles of compound lenses.

Amphibole group; black, coarse, massive.

3D Signs ensure marked areas are visible from all angles.

Brown, earthy, massive; used for yellow pigment.

Brown, fluorescent crystals intergrown in dolomite rock.

Fine to medium-grained with biotite.

Clear, pure cleavages, Mohs’ hardness of 2.

Gray to buff, with numerous ooliths and fossil fragments.

Gray, fine-grained, massive contact rock.

Cleaned, pure, bright, metallic native copper.

Pure, white, earthy “China clay”.

Students Work with Miniature Landfills in Hands-On Investigation

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

Brownish gray, kerogen-rich; commercial oil source.

Chlorite-mica with perfect slaty cleavage.