Rock Pictures

This site will help us identify the type of rock you bring in for 5 bonus points.
http://images.google.com/imgres?imgurl=http://skywalker.cochise.edu/wellerr/rocks/6gneiss-folds58.jpg&imgrefurl=http://skywalker.cochise.edu/wellerr/VGM/rock-hall.htm&usg=__kbqNcdDGn2lAc0ueSa6ozLJBBbQ=&h=455&w=640&sz=100&hl=en&start=59&sig2=SgyMrSHa5pvOSlWJqZoVxw&tbnid=UkP_TghP0_p3uM:&tbnh=97&tbnw=137&prev=/images%3Fq%3Dtypes%2Bof%2Brocks%26gbv%3D2%26ndsp%3D21%26hl%3Den%26sa%3DN%26start%3D42&ei=HEFGS_zdMsyV8AaIvf2JAw