"Freeze-Dried Specimens"

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.

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

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

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

Sale

Amphibole group; black, coarse, massive.