"Sedimentary Rock Specimens"

Black, soft; most widely mined.

Well-cemented, medium-grained orthoquartzite.

Gray and poorly sorted, with a gritty texture.

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.

Gray to tan clastic rock made of silt sized particles.

Red clastic rock composed of sand sized particles and hematite.

Black, fissile; commonly with carbonized fossil plant impressions.

Dense and massive.

Bituminous rich black shale for hands-on investigations.

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

Small, rounded pebbles and tightly cemented granules.

Earthy, porous calcareous tufa.

Hematite-cemented quartz; orthoquartzite.

Typical green-gray, fissile, clay-rich.