Name:  Quartz-Sericite Schist

Geologic Name:  Chickies Quartzite

Reference:  Bascom, Florence, Description of the Philadelphia district:
U.S. Geol. Survey Geol. Atlas, folio (no. 162), p. 4, 1909.

Microscopic characters:  Schistose texture. Quartz showing undulatory 
extinction and long shreds of sericite are the most abundant.
There are few crystals of tourmaline, yellowish-brown rutile, zircon and
abundant magnetite in stringers parallel to the schistosity.