Dissymmetrization in Eudialyte-Group Minerals: 1. A Model of Ordered Cation Arrangement in the Crystal Structure of Amableite-(Ce) Using the P3 Symmetry
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Bibliographic record
Abstract
The crystal structure of a new mineral from the eudialyte group, amableite-(Ce) Na15[(Ce1.5Na1.5)Mn3]Mn2Zr3 $$\square $$ Si[Si24O69(OH)3](OH)2 ⋅ H2O, was refined using X-ray diffraction analysis in the R3 space group. This mineral was discovered in a hyperagpaitic pegmatite in the Saint-Amable massif, Canada. Amableite-(Ce) is a representative of the eudialyte group with the lowest calcium content; it differs from other representatives of this group by the dominance of lanthanides in a part of edge-sharing octahedra of the six-membered ring. The structure of amableite-(Ce) has a unit cell with the following parameters: a = 14.1340(2) Å, c = 30.378(1) Å, and V = 5255.6(3) Å3. In this paper, we propose a model for the distribution of cations within the amableite-(Ce) crystal structure based on a low-symmetry P3 space group. We refined 162 independent atomic positions in the isotropic–anisotropic approximation using 3968 reflections with F > 3σ(F) and obtained R = 4.6% as the final result. Despite the close agreement between the two space groups, the transition from R3 to P3 allows us to obtain a more detailed information about the local distribution of a number of elements over different framework sites. The models of the crystal structure of amableite-(Ce) in the framework of R3 and P3 symmetries, as well as other low-calcium minerals from the eudialyte group that have been studied previously within several space groups, have been compared.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it