Educational Series 5
Guide to
ROCKS AND MINERALS
OF ILLINOIS
Illinois State Geological Survey
STATE of ILLINOIS
William G. Stratton, Governor
DEPARTMENT of
REGISTRATION and EDUCATION
Vera M. Binks, Director
First printing 1959
Second printing 1960
ILLINOIS STATE GEOLOGICAL SURVEY
John C. Frye, Chief
URBANA, ILLINOIS
Printed by Authority of the State of Illinois