@misc{indiciae129846747144,
  title = {Rutile and sphene in blueschist and related high-pressure facies rocks},
  author = {M.C. Blake and Benjamin A. Morgan},
  year = {1975},
  doi = {10.3133/ofr7536},
  url = {https://pubs.usgs.gov/publication/ofr7536},
  note = {Source identifier: ofr7536}
}