Abstract
This paper presents a solid state 1H, 23Na, 29Si, and 119Sn nuclear magnetic resonance (NMR) study of sorensenite. New 29Si NMR data for two related pyroxenoids, wollastonite and pectolite, are included for comparison. By more sensitively probing chemical bonding, the element-specific NMR observations both complement and reinforce the x-ray diffraction results. The role of hydrogen and its interactions with neighboring atoms in sorensenite is further clarified. The wollastonite and pectolite 29Si spectra resolve for the first time all three crystallographic sites and their comparison with sorensenite reveals subtle, systematic differences in sites along the pyroxenoid chains. Effects of corner-shared BeO4 tetrahedra on 29Si shifts show that sorensenite may also be viewed as a more polymerized silicoberyllate.
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