@misc{indiciae7f41a5719312,
  title = {Ternary diagrams of the quartz-feldspar content of pegmatites in Colorado},
  author = {James Jennings Norton},
  year = {1966},
  doi = {10.3133/b1241d},
  url = {https://pubs.usgs.gov/publication/b1241D},
  note = {Source identifier: b1241D}
}