"Freeze-Dried Specimens"

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Brownish black, intermediate stage between peat and bituminous coal.

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

Fine crystalline, pure calcite.

Chlorite-mica with perfect slaty cleavage.

Gray to brown mudstone with abundant silt.

Gray, fine-grained, massive contact rock.

Gray to buff, with numerous ooliths and fossil fragments.

Foliated biotite, coarse, silvery gray with quartz-feldspar bands.

Fightly cemented, medium-to-coarse quartz grains.