Quartzite

nonfoliated, sandy texture

Serpentinite

nonfoliated, microcrystalline

Green schist

foliated, schistose, green chlorite

Gneiss

foliated, coarse grained, alternating light/dark layers

Anthracite coal

nonfoliated, glassy texture, black

Marble

nonfoliated, microcrystalline to coarse texture, reacts to acid

Hornfels

nonfoliated, microcrystalline, dull and dark

Phyllite

foliated, phyllite texture

Soapstone

nonfoliated, microcrystalline, soft

Slate

foliated, fine grained, slaty cleavage, dull luster

Amphibolite

foliated or nonfoliated, medium to coarse, amphiboles visible

Mica schist

foliated, schistose, muscovite