@misc{indiciaee0bf3a169a75,
  title = {Colorado amethyst},
  author = {T.C. Michalski},
  year = {2016},
  doi = {10.1080/00357529.1984.11764436},
  url = {https://pubs.usgs.gov/publication/70013323},
  note = {Source identifier: 70013323}
}