"PARKWAY PLASTICS, INC."

Gray to buff, with numerous ooliths and fossil fragments.

Clear, pure cleavages, Mohs’ hardness of 2.

Pyroxene group; dark green, pure cleaved fragments.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.

Dense and massive.

Pure, bright yellow, Frasch sulfur.

Gray with line crinoid columnal fragments.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Grayish black trap rock.

The Friction Rod Kit has all the materials needed to perform a variety of electrostatic experiments and demonstrations.

Black, Micaceous, glittery metallic.

Reliable kit in a quality carrying case!

Light gray, earthy.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Amphibole group; dark greenish black cleavages, somewhat columnar.