THE STRUCTURES OF TWO NOVEL Sn2+ OXYSALTS FOUND WITH ROMARCHITE AND HYDROROMARCHITE AS CORROSION PRODUCTS OF PEWTER ARTIFACTS
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Bibliographic record
Abstract
The crystal structures of an anthropogenic Sn2+ silicate, Sn6O4(SiO4), hexagonal, space group P63mc, a 7.3742(4), c 11.9598(10) Å, V 563.23(6) Å3, Z = 2, Dcalc 5.12 g/cm3, and an anthropogenic Sn2+ sulfate, Sn6O4(SO4)(OH)2, orthorhombic, space group Pbca, a 14.0071(8), b 12.5016(7), c 14.5030(9) Å, V 2539.6(3) Å3, Z = 8, Dcalc 4.74 g/cm3, were refi ned by full-matrix least-squares techniques on the basis of F2 to agreement indices R1 (Sn2+ silicate and Sn2+ sulfate) of 3.0 and 4.2%, calcu-lated for 704 and 3281 unique observed refl ections (|Fo | ≥ 4F), and wR2 of 5.5 and 11.0 % for all data, respectively. Intensity data were collected at room temperature using MoK radiation and a CCD-based area detector. Both structures contain the [Sn68] cluster [: O2 – or (OH)–], which has been found in several stannous compounds, and which can be derived from the structure of fl uorite. These two compounds occur with romarchite, SnO, and hydroromarchite, Sn3O2(OH)2, on pewter bowls that had become corroded in cold freshwater for approximately 160 years.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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