"bouteille de gaz"

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

Students discover the variety of rocks and minerals with this collection.

Students determine a mineral's hardness between five and 10 on Mohs' scale.

This collection with rock types and associations with the North American continent contains 100 specimens with each group represented: igneous, metamorphic, and sedimentary. Specimens are approximately 1"" x 1"", number-coded in compartmented container.

Everything You Need to Organize Your Specimens

Light gray, fine small clasts.

Gray to white, coarse crystalline, carbonate rock.

Pink/gray coarse carbonate rock.

Lustrous, black 'hard coal'.

Gray to buff, with numerous ooliths and fossil fragments.