"bouteille de gaz"

Gray to white, coarse crystalline, carbonate rock.

Pink/gray coarse carbonate rock.

Lustrous, black 'hard coal'.

4 pounds of limestone chips supplied in a box.

Black, soft; most widely mined.

Gray to buff, with numerous ooliths and fossil fragments.

Brownish black, intermediate stage between peat and bituminous coal.

[NA_SciEd] Ward's® Sandstone (Red)

Gray to brown mudstone with abundant silt.

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