Rockhound http://www.emnrd.state.nm.us/nmparks/PAGES/parks/rockh/rockh.htm
Located on the rugged west slope of the Little Florida Mountains, the park is a favorite for "rockhounds" because of the abundant agates and quartz crystals found there. Hiking trails provide spectacular views of the surrounding landscape.
Rockhounding Arkansas http://rockhoundingar.com/
An authoritative and comprehensive guide to Arkansas geology, minerals, and the hobby of rockhounding. Written by the well known geologist Mike Howard.