"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.

Pure, bright yellow, Frasch sulfur.

Red, classic oolitic texture.

Brown, fluorescent crystals intergrown in dolomite rock.

Brown, earthy, massive; used for yellow pigment.

Black, Micaceous, glittery metallic.

White, fine, massive, opaque to slightly translucent.

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