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• W259771331 abstract "The crystal structures of marialite ( M e 6 ) from Badakhshan, Afghanistan and meionite ( M e 93 ) from Mt. Vesuvius, Italy were obtained using synchrotron high-resolution powder X-ray diffraction (HRPXRD) data and Rietveld structure refinements. Their structures were refined in space groups I 4/ m and P 4 2 / n , and similar results were obtained. The M e 6 sample has a formula Ca 0.24 Na 3.37 K 0.24 [Al 3.16 Si 8.84 O 24 ]Cl 0.84 (CO 3 ) 0.15 , and its unit-cell parameters are a =12.047555(7), c =7.563210(6) Å, and V =1097.751(1) Å 3 . The average ⟨T1-O⟩ distances are 1.599(1) Å in I 4/ m and 1.600(2) Å in P 4 2 / n , indicating that the T1 site contains only Si atoms. In P 4 2 / n , the average distances of ⟨T2-O⟩=1.655(2) and ⟨T3-O⟩=1.664(2) Å are distinct and are not equal to each other. However, the mean ⟨T2,3-O⟩=1.659(2) Å in P 4 2 / n and is identical to the ⟨T2′-O⟩=1.659(1) Å in I 4/ m . The ⟨M-O⟩ [7]=2.754(1) Å (M site is coordinated to seven framework O atoms) and M-A=2.914(1) Å; these distances are identical in both space groups. The M e 93 sample has a formula of Na 0.29 Ca 3.76 [Al 5.54 Si 6.46 O 24 ]Cl 0.05 (SO 4 ) 0.02 (CO 3 ) 0.93 , and its unit-cell parameters are a =12.19882(1), c =7.576954(8) Å, and V =1127.535(2) Å 3 . A similar examination of the M e 93 sample also shows that both space groups give similar results; however, the C–O distance is more reasonable in P 4 2 / n than in I 4/ m . Refining the scapolite structure near M e 0 or M e 100 in I 4/ m forces the T2 and T3 sites (both with multiplicity 8 in P 4 2 / n ) to be equivalent and form the T2′ site (with multiplicity 16 in I 4/ m ), but ⟨T2-O⟩ is not equal to ⟨T3-O⟩ in P 4 2 / n . Using different space groups for different regions across the series implies phase transitions, which do not occur in the scapolite series." @default.
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• W259771331 date "2011-06-01" @default.
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• W259771331 title "The structures of marialite (<i>M</i><i>e</i>₆) and meionite (<i>M</i><i>e</i>₉₃) in space groups<i>P</i>4₂/<i>n</i>and<i>I</i>4/<i>m</i>, and the absence of phase transitions in the scapolite series" @default.
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• W259771331 doi "https://doi.org/10.1154/1.3582802" @default.
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