Crawford,Maria. Metamorphic Rocks. World Book
Encyclopedia. 1995 ed., vol. 13, p. 428.
Hacket, Dr.Jay, Richard Moyer, and Donald Adams.
Science. Toronto: Merill Publishing, Co. 1989. pg.131-
Symes, R. F. Eyewitness Books Rocks & Minerals. New
York: Alfred A. Knopf, 1988.
Woolley, Alan. Spotters Guide to Rocks & Minerals.Tulsa:
Usborne Publishing Limited, 1979, p. 32.
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Photos on this web site were taken by the authors teachers.