The site distribution of iron and anomalous biaxiality in osumilite

Don S. Goldman, George R. Rossman
 Division of Geological and Planetary Sciences
California Institute of Technoogy
Pasadena, CA  91125


Osumilites from Sakkabira, Japan, Obsidian Cliffs, Oregon, and Nain, Labrador have been studied by optical, infrared, and Mössbauer spectroscopy. Osumilite is an anhydrous ineral. A major proportionof the Fe2+ occurs in the channel-like cavities. Biaxial Nain asumilite is X-ray hexagonal, and does not show infrared spectroscopic evidence for Al/Si ordering. The biaxiality arises from the channel contents.


last updated: 25-Jul-2022