Hisingerite and iddingsite on Mars: Degradation of iron-rich basalts

Details Hisingerite and iddingsite on Mars: Degradation of iron-rich basalts Hisingerite and iddingsite on Mars: Degradation of iron-rich basalts

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..175b&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 175 (SEE N87-23341 16-91)

Physics

Geophysics

2

Basalt, Degradation, Iron, Mars Surface, Planetary Composition, Spectrum Analysis, Calcium, Chemical Composition, Magnesium, Olivine, Silicates, Spectral Reflectance

Scientific paper

Paragenetic evidence that indicates that hisingerite may have formed during the evolution of Martian regolith is summarized. Hisingerite was once regarded as poorly crystalline iron-rich smectite or nontronite. However, recent electron microscopy and X-ray studies have revealed hisingerite to have an amorphous or gel structure containing a disordered array of (FeO6) octahedra and (SiO4) tetrahedra. It is just this coordination environment and degree of crystallinity that matches materials simulating the spectral properties of the bright regions of Mars. Therefore, hisingerite and basic ferric sulfate minerals appear to be major contributers to remote sensed reflectance spectral profiles of Mars.

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