"VWR"

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White, mature, friable.

Dark, waxy, bitumin-rich.

Deformed pebbles in a metamorphased conglomerate. Large sawed and lacquered specimen.

Unusual glassy tubes of fused sand produced by lightning strikes in desert sediments. Average size: 1.5"- 2".

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.

Pegmatite is igneous rock similar to granite but with larger crystals.

Obsidian is hard black colored, volcanic glass.

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

Quartzite is hard, non-foliated rock formed from metamorphosed quartz sandstones.