How to Classify Rocks
We classify rocks Into three major groups Igneous Rocks,Sedimentary Rocks, & Metamorphic Rocks.You can tell the rocks by their texture,color,grain,and composition.
http://www.empr.gov.bc.ca/MINING/GEOSCIENCE/PUBLICATIONSCATALOGUE/INFORMATIONCIRCULARS/IC1987-05/Pages/Classified.aspx
http://geomaps.wr.usgs.gov/parks/rxmin/rock.html
http://www.empr.gov.bc.ca/MINING/GEOSCIENCE/PUBLICATIONSCATALOGUE/INFORMATIONCIRCULARS/IC1987-05/Pages/Classified.aspx
http://geomaps.wr.usgs.gov/parks/rxmin/rock.html