"Gary K. Besonson"

Cleaned, pure, bright, metallic native copper.

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

Cut black mica cleavage sheets.

Deep purple crystal clusters.

Pink and gray bands, with biotite; shows good foliation.

Dark brown to black; polycrystalline zinc ore.

Cemented glacial gravel.

Small, rounded pebbles and tightly cemented granules.

Good grade, brass-yellow copper ore, massive.

Black, fissile; commonly with carbonized fossil plant impressions.

White, massive, coarse crystalline vein, Mohs’ hardness of 7.

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

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.

Vanessa cardui Butterflies form chrysalides and transform into colorful butterflies right before your eyes.