'''Intermediate rocks''' are [[igneous rock]]s with between 55% and 65% total [[silica]]. They are named ''intermediate'' as they lie between [[basic rock|basic]] and [[acidic rock|acidic]] in their silica content.
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995), ''p. 251''