Rock Research Click below
http://www2.corvallis.k12.or.us/cimc/petersr/earthmaterialsinternetsites.htm
Rocky the Rockhound
http://www.fi.edu/fellows/fellow1/oct98/index.html
Canadian Rockhound
http://www.canadianrockhound.com/junior/index.html
Building Stones of Our Nation's Capital
http://pubs.usgs.gov/gip/stones/
Moh's Scale
http://www.24carat.co.uk/hardnessmohsscale.html