what is the cost to the environment when mining topaz

  • Gems & Gemology · 2014
    Tao Hsu · Andrew Lucas · Zhili Qiu · Mu Li · Qingyuan Yu
    Zhejiang University · Sun Yat Sen University
  • North Carolina Gemstones: ruby, sapphire, emeralds and

    geology.com › Gemstones › Gemstone Mining in the United States

    Gemstones found in North Carolina include ruby, sapphire, emerald, aquamarine, garnet, moonstone, rose quartz, topaz and tourmaline.