"gel box"

Examine the Mineral Composition of Sedimentary Rocks

Everything You Need to Organize Your Specimens

Chlorite-bearing.

Massive, chlorite-rich.

Medium-grained with biotite.

Gray to white, coarse crystalline, carbonate rock.

Classic, dark; from the Columbia Plateau.

Coarse-grained plagioclase and pyroxene with some olivine.

Fightly cemented, medium-to-coarse quartz grains.

Glassy; most specimens float in water.