"Ward's® Thermochemistry In The Bag Inquiry Demonstration Activities"

Pale pink felsite, with small sanidine phenocrysts.

Fine, common limestone; massive, and will fizzle with HCl.

Gray, fine to medium-grained “Berea grit”.

Dark, waxy, bitumin-rich.

Dark gray with abundant gas pocket vesicles.

Earthy, porous calcareous tufa.

Lustrous, black 'hard coal'.

Small, rounded pebbles and tightly cemented granules.

Cemented glacial gravel.

Brownish black, intermediate stage between peat and bituminous coal.