"Microtomes and Microtome Assemblies"

Typical green-gray, fissile, clay-rich.

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

Chlorite-mica with perfect slaty cleavage.

Brownish gray, translucent.

Gray to white, coarse crystalline, carbonate rock.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Nearly pure, green crystalline forsterite.

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

Silvery, paragranite and muscovite-rich with medium garnet crystals.

Dark, waxy, bitumin-rich.

Brown, earthy, massive; used for yellow pigment.

Fine crystalline, pure calcite.

Red, classic oolitic texture.

Dark gray with abundant gas pocket vesicles.

Gray and poorly sorted, with a gritty texture.

Coal bed leaf impression. Hand specimen.