"PARKWAY PLASTICS, INC."

Brownish gray, kerogen-rich; commercial oil source.

Slaty cleavage; contains hematite.

Chlorite-mica with perfect slaty cleavage.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

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

Put a piece of Earth's ancient history in the hands of your students.

Feldspar group; white-to-gray cleavages of sodic plagioclase; some show twinning.

Clear rhombs showing double refraction.

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Bright metallic cubic cleavages; lead ore.

Black, high grade, foliated, greasy feel.

White, fine, massive, opaque to slightly translucent.

White, fibrous, silky luster.

Clear, pure cleavages, Mohs’ hardness of 2.

Himalayan mineral great for teaching and display.