"The Mystery of Lyle and Louise"

Unpolished metamorphic rock with silky lusture, red-brown colour, and clear parallel intergrown quartz crystals.

Pale pink felsite, with small sanidine phenocrysts.

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

Lustrous, black 'hard coal'.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.

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

Gray to white, coarse crystalline, carbonate rock.

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

Nearly pure, green crystalline forsterite.

Typical green-gray, fissile, clay-rich.