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WikiPedia: Quartzit http://german.about.com/library/blvoc_gerloan.htm http://www.buildingstonemagazine.com/ond-05/quartz... http://sdww2heroes.tripod.com/zerrphotos/id1.html http://www.cst.cmich.edu/users/dietr1rv/quartzite.... http://geology.csupomona.edu/alert/metamorphic/qua... http://kaladarshan.arts.ohio-state.edu/exhib/jade/... http://www.geology.ucdavis.edu/~cowen/~GEL115/115C... http://www.geology.wisc.edu/~maher/air/air14.htm http://books.smenet.org/Surf_Min_2ndEd/sm-ch09-sc0... http://www.dnr.state.mn.us/snas/naturalhistory.htm...