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X-ray absorption near-edge (XANES) spectroscopy is an effective modern tool that can provide unique information on local atomic structure (bond lengths and bond angles) of geological materials. To extract such information with high precision from experimental XANES spectra, advanced theoretical analysis based on supercomputer modeling is needed. XANES spectroscopy and computer modeling have been applied to investigate local atomic structure of some terrestrial and extraterrestrials geological materials. XANES iden...