"The Mystery of Lyle and Louise"

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

White, mature, friable.

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

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

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

Gray to brown mudstone with abundant silt.

Massive, chlorite-rich.

Fightly cemented, medium-to-coarse quartz grains.

Black, soft; most widely mined.

Slaty cleavage; contains hematite.

Light gray, fine small clasts.

Dense and massive.

Hematite-cemented quartz; orthoquartzite.

Chlorite-bearing.

Gray to buff, with numerous ooliths and fossil fragments.

Gray, fine-grained, massive contact rock.