Crystal structures of two new low-symmetry calcium-deficient analogs of eudialyte
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Bibliographic record
Abstract
The crystal structures of two new low-symmetry (sp. gr. R 3) representatives of the eudialyte group from Mont Saint-Hilaire (Quebec, Canada) and the Lovozero massif (Kola Peninsula, Russia) were studied by single-crystal X-ray diffraction analysis and refined to R = 0.068 and 0.054 using 2899 reflections with F > 5σ( F ) and 2927 reflections with F > 3σ( F ), respectively. The idealized formulas of these representatives are Na 13 (Ca 3 Mn 3 )Zr 3 (Fe, Mn) 3 (□)(Si)[Si 3 O 9 ] 2 [Si 9 O 27 ] 2 (O, OH, Cl) 3 · 2H 2 O and Na 15 (Ca 3 Mn 3 )Zr 3 (Fe, Zr) 3 (Si)(Si) · [Si 3 O 9 ] 2 [Si 9 O 27 ] 2 O 2 (OH, F, Cl) 2 · 2H 2 O. Both minerals are analogs of oneillite and are characterized by a low Ca content. The distinguishing features of the mineral from Quebec are that the M (4) site is essentially vacant (>50%) and Ca atoms occupy one independent site in the six-membered ring, whereas another site is occupied by Mn along with a small impurity of Na. In the mineral from the Lovozero massif, both the M (3) and M (4) sites are occupied predominantly by silicon, while Ca atoms are distributed between both octahedral sites of the six-membered ring, one of these sites being occupied predominantly by Mn.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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