"gel box"

Gray to white, coarse crystalline, carbonate rock.

Classic, dark; from the Columbia Plateau.

White, fine, massive, opaque to slightly translucent.

Pink/gray coarse carbonate rock.

Amphibole group; black, coarse, massive.

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

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

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

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

Pure, white, earthy “China clay”.

Cleaned, pure, bright, metallic native copper.

Silvery, paragranite and muscovite-rich with medium garnet crystals.

Fine, common limestone; massive, and will fizzle with HCl.

White, fibrous, silky luster.

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

Light gray, with flow structure.