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
Abstract
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
