"Ward's Phenomena"

Gray and poorly sorted, with a gritty texture.

Coarse grained and abundant in plagioclase feldspar.

Light gray, fine-grained, well-foliated, schistose.

Red-brown to gray, coarse-grained, containing feldspar and mica.

Gray-to-brown basaltic, with over 50% vesicles.

Massive, chlorite-rich.

Dark, coarse-grained, and composed chiefly of hornblende.

Shiny black volcanic glass showing conchoidal fracture and some spherulites.

Gray, fine-grained, massive contact rock.

Gray to brown mudstone with abundant silt.

White, very dark green, and very dark red to light red granoblastic intergrowth of wollastonite, diopside, and andradite.

When minerals, rocks, and fossils cannot be accurately identified by macroscopic observation and testing, thin section slides can reveal the composition and structure of the specimens on a microscopic level.

Coarse-grained plagioclase and pyroxene with some olivine.

Dark-green 'verde antique', containing some chlorite and calcite.

Classic, very coarse-grained igneous texture.

Coarse, 'salt and pepper': dark pyroxene and light andesine. Provides perfect representation of an intermediate igneous rock.