@misc{indiciae5534b9745b6a,
  title = {Composition of zeolites of the natrolite group; compositional relations among thomsonites, gonnardites and natrolites},
  author = {Margaret D. Foster},
  year = {1965},
  doi = {10.3133/pp504de},
  url = {https://pubs.usgs.gov/publication/pp504DE},
  note = {Source identifier: pp504DE}
}