Cordierite appears in the sillimanite zone. Staurolite and cordierite appear at the same grade as andalusite and chloritoid does not occur. Subhedral porphyroblasts of kyanite and staurolite are concentrated in thin layers of foliated white mica that probably represents clay-rich mud layer in succession of beach sands. Staurolite grains that are colorless may be confused with kyanite, with which it commonly occurs, but kyanite is optically negative. Tiny grains zoned from pale blue-green core to olive brown rim, are tourmaline .
Opaque mineral is ilmenite .
Rock represents metamorphism at grade slightly higher than that recorded by rocks from Townshend dam on the west flank of the Athens dome. Staurolite occurs as nearly euhedral porphyroblasts. It commonly has abundant quartz inclusions, but may be, as most grains here, inclusion-free. Staurolite grains that are colorless may be confused with kyanite, with which it commonly occurs, but kyanite is optically negative. Notice the inclusions of pleochroic green-blue chloritoid in garnet.