"Freeze-Dried Specimens"

Brownish gray, translucent.

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

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

Nearly pure, green crystalline forsterite.

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.

Red, earthy, in natural chunk form; common pigment ore.

Brown, earthy, massive; used for yellow pigment.

Light pink, massive, crystalline, translucent.

Deep blue, massive, with nepheline; key feldspathoid.

A classroom set that covers the major types of coal.