@misc{indiciae9ed51989c9cc,
  title = {Aluminum in hornblende: an empirical igneous geobarometer.},
  author = {J. M. Hammarstrom and E. Zen},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70015213},
  note = {Source identifier: 70015213}
}