"The Mystery of Lyle and Louise"

Brown, fluorescent crystals intergrown in dolomite rock.

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

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

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

Brown, earthy, massive; used for yellow pigment.

Nearly pure, green crystalline forsterite.

Light pink, massive, crystalline, translucent.

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