"Gary K. Besonson"

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

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”.

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

Cut black mica cleavage sheets.

Deep purple crystal clusters.

Well-cemented, medium-grained orthoquartzite.

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

Medium-grained with biotite.

This decorative gravel is also essential for maintaining your aquarium, acting as a substrate for the bacteria cultures necessary for a healthy tank.