"The Mystery of Lyle and Louise"

Gray, fine-grained, massive contact rock.

Gray to buff, with numerous ooliths and fossil fragments.

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

Lustrous, black 'hard coal'.

Red-brown to gray, coarse-grained, containing feldspar and mica.

Silvery, paragranite and muscovite-rich with medium garnet crystals.

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.