"The Mystery of Lyle and Louise"

Gray to white, coarse crystalline, carbonate rock.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Fightly cemented, medium-to-coarse quartz grains.

Gray, fine to medium-grained “Berea grit”.

Hematite-cemented quartz; orthoquartzite.

Typical green-gray, fissile, clay-rich.

Chlorite-mica with perfect slaty cleavage.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

Dehydrated Preserved

Formalin Preserved

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.

Chlorite-bearing.