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Authors: Quartieri, S. 
Boscherini, F. 
Dalconi, C. 
Iezzi, G. 
Meneghini, C. 
Oberti, R. 
Title: Magnesium K-edge EXAFS study of bond-length behaviour in synthetic pyrope-grossular garnet solid solution
Issue Date: Feb-2008
Series/Report no.: /93(2008)
DOI: 10.2138/am.2008.2831
Keywords: Pyrope-grossular garnets
local environment
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks 
Abstract: Direct structural characterization of the changes in the local environment of Mg occurring in the garnet structure as a function of the Ca content are determined by Mg K-edge X-ray absorption fine structure on synthetic samples along the pyrope-grossular join. With increasing Ca content, the short Mg-O2 distance of the dodecahedron slightly decreases, while the long Mg-O4 distance tends to increase, so that the dodecahedron is more distorted in grossular-rich garnets than in end-member pyrope. This quantitative direct description of the changes in the local environment of Mg in the pyrope-grossular solid solution confirms and better defines previous experimental and recent computational results.
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