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203 bytes added ,  06:07, May 25, 2007
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[[Igneous rock]] with over 65% total [[silica]] and over 20% [[quartz]].

Pellant, p. 250

=Sources=
*Pellant, Chris. ''The Complete Book of Rocks and Minerals'', Dorling Kindersley Inc.: New York (1995)
nsTeam1RO, nsTeam1RW, nsTeam1_talkRO, nsTeam1_talkRW
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