REFINEMENT OF THE CRYSTAL STRUCTURE OF AMINOFFITE
Why this work is in the frame
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Bibliographic record
Abstract
Aminoffite, (Ca2.95Mn0.08Pb0.01)(BeOH)2(Si2.95As0.03)O10, is tetragonal, P42/n, a 9.809(1), c 9.844(2) A, V 947.3(3) A 3 , Z = 12. The structure was refined to an R index of 2.9% based on 1265 observed (| Fo | > 5� F) reflections measured with a four-circle single-crystal diffractometer and MoKX-radiation. There are two Si sites and one Be site in the structure of aminoffite, each coordinated by four anions in a tetrahedral arrangement. There are two distinct Ca sites, coordinated by six O-atoms, and one and two (OH) groups, respectively, with distances of 2.467 and 2.436 A. The single H-atom is part of an (OH) group that is part of the (Be� 4) (� : unspecified anion) tetrahedron. The (SiO4) groups link to form linear (Si3O10) trimers that are linked by (Be� 4) groups to form a sheet of tetrahedra parallel to (001). These sheets stack in the (001) direction and are linked together by interstitial Ca atoms and by hydrogen bonding. Details of the sheet topologies in Be minerals with two-dimensional structural units are examined; (Be� 4) tetrahedra show a marked preference for trivalent vertices in two-dimensional nets. Bond-valence considerations show that such (Be� 4) tetrahedra must have a monovalent anion (usually (OH)) at one vertex, and hence most such structures have acid {BeO3(OH)} groups.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.004 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
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