"The Mystery of Lyle and Louise"

Black, soft; most widely mined.

Slaty cleavage; contains hematite.

These fascinating frogs are uniquely adapted for climbing, with prominent adhesive pads on the ends of their digits.

Lustrous, black 'hard coal'.

Pale pink felsite, with small sanidine phenocrysts.

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

Light gray, fine small clasts.

Dense and massive.

Hematite-cemented quartz; orthoquartzite.

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

Chlorite-bearing.

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Gray to buff, with numerous ooliths and fossil fragments.

Gray, fine-grained, massive contact rock.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.