"Gary K. Besonson"

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Deep purple crystal clusters.

Cut black mica cleavage sheets.

Well-cemented, medium-grained orthoquartzite.

Light gray, fine-grained, well-foliated, schistose.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Coarse-grained, with microcline, biotite and horblende phenocrysts.

An alternative to a ballistic pendulum designed to demonstrate the conservation of momentum.

Cleaned, pure, bright, metallic native copper.

Gray with line crinoid columnal fragments.

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

Pure, white, earthy “China clay”.

This fast and easy activity acquaints students with electrophoresis using inexpensive dyes.

Medium-grained with biotite.

A high bandwidth, high voltage 100x passive voltage probe with a 100 MΩ input impedance.

Sand, pebbles, and gravel are all ideal for earth science experiments and simulated excavations.