"VWR"

Gray to buff, with numerous ooliths and fossil fragments.

Dense and massive.

Gray, fine to medium-grained “Berea grit”.

Hematite-cemented quartz; orthoquartzite.

Typical green-gray, fissile, clay-rich.

Brownish gray, kerogen-rich; commercial oil source.

Well-cemented, medium-grained orthoquartzite.

Black, soft; most widely mined.

Cemented glacial gravel.

Small, rounded pebbles and tightly cemented granules.

Introduce your students to rocks formed from deposition of sediment.

White, mature, friable.

Dark, waxy, bitumin-rich.

Without Glued-On Grains That Wear Off, Chart Stands up to Repeated use.

Red clastic rock composed of sand sized particles and hematite.

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