"The Mystery of Lyle and Louise"

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

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

Brownish gray, translucent.

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.

Red, earthy, in natural chunk form; common pigment ore.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Nearly pure, green crystalline forsterite.

Brown, earthy, massive; used for yellow pigment.

Red, classic oolitic texture.

Light pink, massive, crystalline, translucent.