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Chromium  K -edge X-ray absorption spectra were collected to characterize Cr in forsterite (Mg 2 SiO 4 ) as well as sulfides within the MAC 88136 EL3 chondrite to determine Cr valence and to see whether forsterite within this meteorite can be used as a Cr 2+ -silicate standard. Spectra were measured on several areas within a nearly pure 100 × 200 μm forsterite grain containing 0.13 wt% Cr. XANES findings indicate highly reduced Cr 2+  species, with no clear evidence of Cr 3+  or Cr 6+ . EXAFS data indicate an average 2.02 Å Cr-O nearest-neighbor distance, consistent with Cr-O distances found in square-planar Cr 2+ O 4  sites observed in synthetic crystalline silicates, and an average 2.69 Å Cr-Si second-nearest neighbor distance, consistent with Cr 2+  substituting for Mg 2+  in the forsterite M(1) site. Nearest-neighbor Debye-Waller factor and coordination number parameters indicate Cr 2+  is likely entering forsterite in disordered sites that are possible intermediates between M(1) and squareplanar Cr 2+ O 4  configurations. Preliminary Cr XAS measurements on sulfides within this meteorite also indicate Cr 2+  in CrS 6  octahedra.

X-ray absorption characterization of Cr in forsterite within the MacAlpine Hills 88136 EL3 chondritic meteorite