"gel box"

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Good grade, green, massive; copper ore.

Nearly pure, green crystalline forsterite.

Red, classic oolitic texture.

Brown, fluorescent crystals intergrown in dolomite rock.

Brown, earthy, massive; used for yellow pigment.

Black, Micaceous, glittery metallic.

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

White, fine, massive, opaque to slightly translucent.

Amphibole group; black, coarse, massive.

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

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

Pure, white, earthy “China clay”.

Cleaned, pure, bright, metallic native copper.

White, fibrous, silky luster.

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