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

Pink/gray coarse carbonate rock.

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

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.

Lustrous, black 'hard coal'.

Small, rounded pebbles and tightly cemented granules.

Cemented glacial gravel.

Brownish black, intermediate stage between peat and bituminous coal.