"The Mystery of Lyle and Louise"

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

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

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

Nearly pure, green crystalline forsterite.

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

Brownish gray, translucent.

Brown, earthy, massive; used for yellow pigment.

Light pink, massive, crystalline, translucent.

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

Brown, fluorescent crystals intergrown in dolomite rock.