@misc{indiciae28042102b4ba,
  title = {Computerized database of the optical properties of the opaque minerals [Compiled from "Tables for microscope identification of Ore minerals", by Uytenbogaardt and Burke]},
  author = {Joseph F. Whelan},
  year = {1988},
  doi = {10.3133/ofr88260a},
  url = {https://pubs.usgs.gov/publication/ofr88260A},
  note = {Source identifier: ofr88260A}
}