The hydrous component of pyrope from the Dora Maira Massif, Western Alps

GEORGE R. ROSSMAN, ANTON BERAN
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena,
California, 91125, U.S.A.

KLAUS LANGER
Institut fur Mineralogie und Kristallographie, Technische Universitat Berlin, D-1000 Berlin 12,
West Germany

Abstract

Pyrope from the Dora Maira Massif, Western Alps, contains a trace hydroxide component (0.003 to 0.002 wt. %). Its infrared absorption spectrum, consisting of four sharp bands in the 3,600-3,660 cm-1 region, is different from that of all other reported pyrope and pyrope-almandine garnet spectra, and does not correspond to the known hydrous inclusions in the pyrope.

Dora Maria

Infrared spectrum of a series of 0.5 mm thick slices of pyrope from the Doria Maria Massif.