"Freeze-Dried Specimens"

Pyroxene group; gray-green, coarse crystalline.

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

Deep blue, massive, with nepheline; key feldspathoid.

A classroom set that covers the major types of coal.

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

White, fine, massive, opaque to slightly translucent.

Red, classic oolitic texture.

Pure, white, earthy “China clay”.

Cleaned, pure, bright, metallic native copper.

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.