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Modeling the reflectance spectrum of Callisto 0.25 to 4.1μm Modeling the reflectance spectrum of Callisto 0.25 to 4.1μm

The reflectance spectrum of Callisto from 0.2 to 4.1 μm is modeled using a simultaneous intimate plus areal mixture solution of ice and dark material which satisfies absorption band depths and reflectance levels. The model uses the radiative transfer theory based on Hapke's (1981, J. Geophys. Res. 86, 3039–3054) work, optical constants of materials and includes effects of grain size and...
Authors
Wendy M. Calvin, Roger N. Clark

Infrared spectra and crystal chemistry of scapolites: implications for Martian mineralogy Infrared spectra and crystal chemistry of scapolites: implications for Martian mineralogy

Near‐infrared and midinfrared spectra of a wide range of scapolite compositions were studied to determine the cause of the 2.36‐μm features that have been correlated with similar features in the near‐IR spectrum of Mars. We attribute the 2.36−μm features to vibrations caused by HCO3− and HSO4− in the anion sites of scapolite. The 2.36‐μm absorption complex consists of four overlapping...
Authors
Gregg A. Swayze, Roger N. Clark

Mineral resources of the Gibraltar Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona Mineral resources of the Gibraltar Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona

No abstract available.
Authors
R. G. Eppinger, J.A. Peterson, H. R. Blank, K.E. Livo, D. H. Knepper, J. A. Pitkin, J.E. Spencer, S. J. Reynolds, M. J. Grubensky, T.J. Kreidle, D.C. Scott

High spectral resolution reflectance spectroscopy of minerals High spectral resolution reflectance spectroscopy of minerals

The reflectance spectra of minerals are studied as a function of spectral resolution in the range from 0.2 to 3.0 μm. Selected absorption bands were studied at resolving powers (λ/Δλ) as high as 2240. At resolving powers of approximately 1000, many OH‐bearing minerals show diagnostic sharp absorptions at the resolution limit. At low resolution, some minerals may not be distinguishable...
Authors
R. N. Clark, T. V. V. King, M. Klejwa, Gregg A. Swayze, N. Vergo
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