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Univ. Ill. at Chicago, Dep. Geol. Sci., Chicago, IL, United States
Single-crystal X-ray analysis (R 1 = 0.030, R 2 = 0.031) in space group Cc. On a statistical basis, the M(1) site (mean M(1)-O = 2.14Aa) contains 0.55 Li and 0.45 vacancy, whereas the M(2) and M(3) sites (mean M(2)-O, = 1.902,M(3)-O = 1.903Aa) are fully occupied by Al. In the tetrahedral sites, the ordering of Al,Be relative to Si is nearly complete (mean T-O: 1.723, 1.721, 1.632, 1.628Aa) with a similar pattern to that found in margarite.--Modified journal abstract.
This record provided courtesy of AGI/GeoRef.
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