@misc{indiciaed01bfb0874ef,
  title = {Mineral Commodity Profiles -- Rubidium},
  author = {W. C. Butterman and R.G. Reese},
  year = {2003},
  doi = {10.3133/ofr0345},
  url = {https://pubs.usgs.gov/publication/ofr0345},
  note = {Source identifier: ofr0345}
}