Edgarite, FeNb3S6, from the Khibina Alkaline Complex, Russia: Solution of the Crystal Structure
Why this work is in the frame
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Bibliographic record
Abstract
The crystal structure of edgarite, a rare Fe-Nb sulfide mineral, was solved using intensity data collected from a crystal from the Khibina alkaline massif, Russia. The study revealed that the structure is hexagonal, space group P63, with cell parameters a 5.912(1), c 12.675(2) ̊A, and V 383.7(1) ̊A3. Refinement of an anisotropic model led to an R index of 0.0392 for 580 independent reflections. One Fe and three Nb sites occur in the crystal structure of edgarite. Edgarite is shown to have the formula FeNb3+2Nb4+S6. Niobium can be expected to be chalcophile in unusually reducing crustal assemblages and to be trivalent and tetravalent in the mantle.
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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 | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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