"Avantor"

Foliated biotite, coarse, silvery gray with quartz-feldspar bands.

Quartzite is hard, non-foliated rock formed from metamorphosed quartz sandstones.

Pink Gneiss is foliated pink and black bands of biotite.

Slaty metamorphic rock containing hematite giving it its red color.

Gray metamorphosed shale showing "slaty cleavage".

Gray to white metamorphosed carbonate rock.

Soapstone is a talc-schist primarily composed of talc.