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[[Igneous rock]] with over 65% total [[silica]] and over 20% [[quartz]].
'''Acid rocks'' are [[igneous rock]]s with over 65% total [[silica]] and over 20% [[quartz]].
Pellant, p. 250
Pellant, p. 250
=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'', Dorling Kindersley Inc.: New York (1995)
[[category:geology]]
[[category:Igneous rocks]]