"The Mystery of Lyle and Louise"

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

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

White, mature, friable.

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

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

Gray to brown mudstone with abundant silt.

Fightly cemented, medium-to-coarse quartz grains.

Black, soft; most widely mined.

Pale pink felsite, with small sanidine phenocrysts.

Light gray, fine small clasts.