@misc{indiciae7a8b500b5de6,
  title = {Mineral resource of the month: fluorspar},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {2010},
  url = {https://pubs.usgs.gov/publication/70045902},
  note = {Source identifier: 70045902}
}