Dig into the types of rocks that make up our planet as you learn about igneous, sedimentary, and metamorphic rocks. Learn what makes up minerals and what a crystal is. Plus, take a closer look at 23 specific rocks and crystals and their uses including granite, basalt, diorite, felsite, conglomerate, sandstone, shale, limestone, dolomite, marble, quartzite, serpentine, schist, agate, amethyst, carnelian, diamond, hematite, kyanite, rhodochrosite, sulfur, tourmaline, and turquoise.Students can per