"gel box"

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Gray, fine, friable, with abundant small sanidine crystal fragments.

Light gray, earthy.

Chlorite-mica with perfect slaty cleavage.

Gray-to-brown basaltic, with over 50% vesicles.

Pink/gray coarse carbonate rock.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

Light gray, fine-grained, well-foliated, schistose.

Slaty cleavage; contains hematite.

Buff-colored, coarse, detrital limestone, with cemented shell fragments.