Learn About Rocks
http://ratw.asu.edu/aboutrocks_whatarerocks_2.html
WebRocks are combinations of one or more minerals that we find in nature. For example: Limestone is composed of only one mineral – calcite. Basalt is commonly composed of three minerals – feldspar, pyroxene, and olivine. Granite is commonly composed of five minerals – two kinds of feldspar, mica, amphibole, and quartz.
DA: 35 PA: 4 MOZ Rank: 44