Minerals (cont'd)  

General Mineralogical Information:  http://www.minrec.org/

Fluorescent Mineral Gallery:  http://www.minerant.org/gallery1.html

Geology and Geography

Iowa Geological Survey: 
http://www.igsb.uiowa.edu/

Wisconsin Geological and Natural History Survey:  http://www.uwex.edu/wgnhs/

Minnesota Department of Natural Resources:  http://www.dnr.state.mn.us/snas/naturalhistory.html

Illinois State Geological Survey:  http://www.isgs.uiuc.edu/

The Smoky Hill region, a part of Kansas with many mineralogical formations :  http://www.kgs.ku.edu/Extension/smoky/places.html