"Sedimentary Rock Specimens"

Useful for weathering and erosion, soil formation, porosity and permeability, or other general earth science labs.

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

Dense and massive.

Black, fissile; commonly with carbonized fossil plant impressions.

Earthy, porous calcareous tufa.

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Small, rounded pebbles and tightly cemented granules.

Hematite-cemented quartz; orthoquartzite.

Brownish black, intermediate stage between peat and bituminous coal.

Typical green-gray, fissile, clay-rich.

Gray to brown mudstone with abundant silt.

Hardened natural cement of calcium carbonate that binds other material such as gravel, sand, clay, and silt.

White, mature, friable.

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.

Gray with line crinoid columnal fragments.

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