"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 gray with abundant gas pocket vesicles.

Earthy, porous calcareous tufa.

Dark, waxy, bitumin-rich.

Lustrous, black 'hard coal'.

Small, rounded pebbles and tightly cemented granules.

Cemented glacial gravel.

Light gray, earthy.