Refinement of the Crystal Structure of Schneiderhöhnite
Bibliographic record
Abstract
The crystal structure of schneiderhohnite, Fe2+Fe3+3As3+5O13, triclinic P ![Graphic][1] , a 8.945(3), b 10.022(3), c 9.161(4) A, α 62.942(5), β 116.072(6), γ 81.722(6)°, has been refined to an R 1 value of 1.4%. The structure is very close to that reported by [Hawthorne (1985)][2], but detailed examination of the structural connectivity shows that schneiderhohnite is better described as a sheet structure than as a framework structure. Zig-zag chains of edge-sharing Fe (1), Fe (2), Fe (3) (= Fe3+) octahedra extend parallel to the c axis, and these chains are cross-linked into a corrugated sheet by tetramers of edge-sharing Fe (4) (= Fe3+) and Fe (5) (= Fe2+) octahedra. (As3+O3) triangular pyramids decorate the surface of this sheet of octahedra as single (AsO3) groups, with all three short bonds linked to anion vertices of the octahedra, and as two crystallographically distinct [As2O5] dimers with four short bonds (two from each As3+) to octahedron vertices. The sheets are connected along [100] via the bridging anion of one of the two [As2O5] dimers that bonds to an Fe2+ octahedron of the adjacent sheet, imparting a strong sheet-like character to the structure and accounting for the perfect (100) cleavage. [1]: /embed/inline-graphic-1.gif [2]: #ref-6
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".