"The Mystery of Lyle and Louise"

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

White and black bands of quartz, feldspar, and biotite; typical foliation.

1 pound of black sand packaged in a heat-sealed bag.

The nocturnal hermit crab uses “borrowed” shells to protect its relatively soft body, changing shells as it grows larger.

Massive, chlorite-rich.

Gray to brown mudstone with abundant silt.

Fightly cemented, medium-to-coarse quartz grains.

Pale pink felsite, with small sanidine phenocrysts.

Black, soft; most widely mined.

Slaty cleavage; contains hematite.