THE CRYSTAL CHEMISTRY OF THE GRAFTONITE-BEUSITE MINERALS
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Bibliographic record
Abstract
The crystal structures of seven members of the graftonite-beusite series, ideally (Fe 2+ ,Mn 2+ ,Ca) 3 (PO 4 ) 2 , monoclinic P 2 1 / c, a 8.77–8.81, b 11.43–11.58, c 6.13–6.17 A, β 99.19–99.32°, V 607.5–617.7 A 3 , have been refined to R 1 indices of 2.1–3.7% using ~1300–1600 unique observed reflections (| F o | > 5 σ F ) collected using a single-crystal diffractometer equipped with Mo K α X-radiation. The crystals used in the collection of the X-ray data were subsequently analyzed with an electron microprobe and the structural and microprobe results were used to assign site populations. The refined site-scattering values and linear variation in mean bond-length as a function of aggregate-cation radius indicate that Ca is completely ordered at the M (1) site. Similarly Mn is ordered at the M (1) and M (3) sites, with any excess Mn occurring at M (2), and Mg is completely ordered at M (2). Detailed consideration of incident bond-valence sums at the three M sites indicates that the coordination numbers of the M (1), M (2), and M (3) sites are [8], [5], and [6], respectively, although the differences between these and [7], [5], and [5] are very small. Ca is dominant at the M (1) site in a previously refined beusite structure, and there are compositions reported here and elsewhere in which Ca is dominant at M (1) in graftonite-like compositions, indicating the potential for new mineral species in this group.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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