"Avantor"

Specially selected topsoil, 1 lb.

Specially selected subsoil, 1 lb.

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.

Gray to tan clastic rock made of silt sized particles.

Breccia is a sedimentary rock made up of angular rock fragments.

Bituminous rich black shale for hands-on investigations.

Carbonate rock formed by the precipitation from water.

Scoria is a dark-colored rock formed from lava with a high gas content.

Conglomerate is a sedimentary rock made up rounded quartz pebbles.