Abstract
Crystal structures have been refined from single-crystal X-ray data for eight synthetic clinopyroxenes in the system NaScSi2O6-CaZnSi2O6, crystallized at 1470-1570 K and 6GPa pressure. The structures are isomorphous with other sodium and/or calcium pyroxenes. The space group is C2/c, Z=4. Sc and Zn occupy a distorted octahedral(M1) site. The O1-Si-O2 angles correlate with the differences, dbr-nbr=mean -mean (br=bridging, nbr=nonbridging) in such a way as to follow two different trends, suggesting that there are two different electronic states for the octahedral Zn2+ ions.
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