"WardsSci000452"

Black, soft; most widely mined.

Gray and poorly sorted, with a gritty texture.

Well-cemented, medium-grained orthoquartzite.

Buff-colored, coarse, detrital limestone, with cemented shell fragments.

Massive sedimentary gypsum with a moh's hardness 2..

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

Red, medium, to coarse-grained iron oxide cement; shows hematite bands.

Black, fissile; commonly with carbonized fossil plant impressions.

Gray to tan clastic rock made of silt sized particles.

Red clastic rock composed of sand sized particles and hematite.

Sale

Dense and massive.

Bituminous rich black shale for hands-on investigations.

Sale

Limestone is a gray calcium carbonate that will fizz with dilute HCl.

Sale

Light gray, fine small clasts.

Earthy, porous calcareous tufa.

Red-brown to gray, coarse-grained, containing feldspar and mica.