TY - RPRT TI - On the Al2SiO5 triple point and the natural occurrence of two Al2SiO5 polymorphs under the same P-T conditions AU - Bruch S. Hemingway PY - 1992 DO - 10.3133/ofr92298 UR - https://pubs.usgs.gov/publication/ofr92298 ID - ofr92298 ER -