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| − | ACIIDDD ROCK IS BEST MUSIC GENRE I R8 8/8
| + | '''Acid rocks''' are [[igneous rock]]s with over 65% total [[silica]] and over 20% [[quartz]]. |
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| | + | ==Sources== |
| | + | *Pellant, Chris. ''The Complete Book of Rocks and Minerals'', p.250, Dorling Kindersley Inc.: New York (1995) |
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| | + | [[category:Igneous Rocks]] |