@misc{indiciae557bd3c3bf86,
  title = {Coexistence of twisted and untwisted crystals: An impurity/structural order model with implications for agate patterns},
  author = {J. Comer and P. Ortoleva},
  year = {2007},
  doi = {10.2138/am.2007.2547},
  url = {https://pubs.usgs.gov/publication/70031454},
  note = {Source identifier: 70031454}
}