@misc{indiciaea13a3b0a7b11,
  title = {δ 30 Si systematics in a granitic saprolite, Puerto Rico},
  author = {Karen Ziegler and Oliver A. Chadwick and Arthur F. White and Mark A. Brzezinski},
  year = {2005},
  doi = {10.1130/g21707.1},
  url = {https://pubs.usgs.gov/publication/70028224},
  note = {Source identifier: 70028224}
}