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Fightly cemented, medium-to-coarse quartz grains.

Black, Micaceous, glittery metallic.

Shiny crystal clusters and crystalline groups, this 'fools gold' is brassy and leaves a black streak.

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

Dark brown to black; polycrystalline zinc ore.

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

Amphibole group; dark greenish black cleavages, somewhat columnar.

Grayish black trap rock.

Spinel group; iron-black, massive; natural magnet.

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

Spinel group; black, dull metallic luster; common iron oxide.

Amphibole group; black, coarse, massive.

Buff-colored, coarse, detrital limestone, with cemented shell fragments.

Light gray, compact, hard, opaque, microcrystalline silica mineral.

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

Cool and colorful dragons liven up genetics lessons.