minerals chart rocks

  • Rocks: Pictures of Igneous, Metamorphic and Sedimentary Rocks

    Rocks hold the history of the earth and the materials that will be used to build its future. Siltstone is a sedimentary rock composed mainly of silt-sized particles. Mineral Show Photos From the 2010 Tucson Gem, Mineral & Fossil Show. Unakite is a metamorphosed granite composed of .