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'''Acid rocks''' are [[igneous rock]]s with over 65% total [[silica]] and over 20% [[quartz]].
'''Acid rocks''' are [[igneous rock]]s with over 65% total [[silica]] and over 20% [[quartz]].
==Sources==
==Sources==
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', p.250, Dorling Kindersley Inc.: New York (1995)
[[category:Igneous Rocks]]
[[category:Igneous Rocks]]