Is there a free app to identify rocks
There is an app to identify rocks. One of those apps is the Rocks & Gems. This app helps you to identify and also learn more about the rocks, gems and even minerals. Check it out at http://itunes.apple.com/us/app/rocks-gems/id351060567?mt=8.
Geology.com might have something for ya. I loiter around over there sometimes and they have some interesting articles regarding geology. Might also check out USGS.gov.