REFINEMENT OF THE CRYSTAL STRUCTURE OF VAYRYNENITE
Bibliographic record
Abstract
Vayrynenite, (Mn2+0.78Fe2+0.23Mg0.01)Be(PO4)(OH0.92F0.08), is monoclinic, a 5.4044(6), b 14.5145(12), c 4.7052(6) A, β 102.798(9)°, V 359.91(7) A3, space group P 21/ a , Z = 4. The structure was refined to an R index of 1.5% based on 1001 observed [| F o| > 5σ F ] for reflections measured with Mo K α X-radiation using a single-crystal diffractometer. In the structure of vayrynenite, (Beφ4) tetrahedra connect to adjacent (Beφ4) tetrahedra by corner-sharing of anions in a zigzag pattern to form a chain that extends in the a direction. This chain is decorated along its periphery by (PO4) tetrahedra that corner-share with one O atom from each of two different (Beφ4) tetrahedra to form ribbons along the c axis. These [Be2(OH)2(PO4)2]n4n− ribbons, which somewhat resemble the [Be2(OH)2(SiO4)2] chains in euclase, AlBe(SiO4)(OH), are linked in the b direction by (Mn2+,Fe2+) in octahedral coordination. The resultant (001) sheets are linked to adjacent sheets in the c direction by corner-sharing of O atoms between (PO4) tetrahedra and {(Mn,Fe) φ6}octahedra, and by hydrogen bonds. The hydrogen position was determined directly, and a sensible hydrogen-bonding scheme established. The connectivity of the (Beφ4– T φ4) ( T = Si,P) chains in Be minerals is examined, and arranged in a hierarchy of increasing topological complexity.
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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 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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".