Manganese-rich olivines: Identification from spectral reflectance properties

Details Manganese-rich olivines: Identification from spectral reflectance properties Manganese-rich olivines: Identification from spectral reflectance properties

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...10225575c&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue E11, p. 25575-25580

Physics

3

Mineralogy And Petrology

Scientific paper

Reflectance spectra of manganese-rich olivines were examined to determine which spectral features allow these minerals to be distinguished from forsteritic-fayalitic olivines. The results indicate that manganese-rich olivines can be distinguished on the following bases: Fe2+M2 absorption band depths are reduced relative to Fe2+M1 depths, the wavelength position of the Fe2+M2 absorption band is shifted to longer wavelengths (>1.08μm) for olivines containing between ~10 and 70 mol % Mn2SiO4, and the presence of an isolated Mn2+ transition band near 0.4 μm. The absence of Fe2+ spin forbidden features in the visible wavelength region is not a reliable method for identifying manganese-rich olivines.

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