"Microtomes and Microtome Assemblies"

Chlorite-mica with perfect slaty cleavage.

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

Yellow to orange crystal with a glassy luster and smooth, often transparent appearance.

Gray to white, coarse crystalline, carbonate rock.

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

Nearly pure, green crystalline forsterite.

Brown, earthy, massive; used for yellow pigment.

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

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

Typical green-gray, fissile, clay-rich.