POLYPHITE AND SOBOLEVITE: REVISION OF THEIR CRYSTAL STRUCTURES
Why this work is in the frame
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Bibliographic record
Abstract
The crystal structures of polyphite, Na5 (Na4Ca2) Ti2 [Si2O7] (PO4)3 O2 F2, triclinic, space group P 1, Z = 2, a 5.3933(2), b 7.0553(3), c 26.451(1) A, α 95.216(1), β 93.490(1), γ 90.101(1)°, V 1000.44(8) A3, and sobolevite, Na12 Ca (NaCaMn) Ti2 (Ti Mn) [Si2O7]2 (PO4)4 O3 F3, monoclinic, space group Pc , Z = 2, a 7.0755(5), b 5.4106(4), c 40.623(3) A, β 94.42(1)°, V 1552.8(3) A3, from the Khibina–Lovozero alkaline complex, Kola Peninsula, Russia, have been refined (for the holotype single crystal of polyphite) to residual R values of 3.7 and 4.3%, respectively, using 5849 and 9030 observed (| F o| > 4σ F ) reflections collected with a single-crystal diffractometer fitted with a CCD detector and Mo K α X-radiation. The single crystals were subsequently analyzed with an electron microprobe, resulting in significant revision of both chemical formulae. There is a close relation among the structures of polyphite, sobolevite and quadruphite, Na14 Ca2 Ti4 [Si2O7]2 (PO4)4 O4 F2. This type of structure consists of two structural blocks, Ti-silicate ( TS ) and alkali-cation ( AC ), stacked along [001]. There is also a close relation among the silicophosphate minerals polyphite, sobolevite, quadruphite and nacaphite, Na (Na,Ca)2 (PO4) F. The TS block has a three-layered structure consisting of a central sheet of octahedra and two adjacent heteropolyhedral sheets. The AC block consists of nacaphite-like trimeric clusters that link along [100] to form an infinite chain. The TS and AC blocks link together through an intermediate ( I ) layer of Na polyhedra and P tetrahedra. In polyphite, sobolevite and quadruphite, all cations are arranged as close-packed layers parallel to (001) and characterized by a plane unit-cell approximately 5.4 × 7 A with γ ≈ 90°.
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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) | 0.001 | 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