CRYSTAL STRUCTURE AND CRYSTAL CHEMISTRY OF LITHIUM-BEARING MUSCOVITE-2 <i>M</i> 1
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Bibliographic record
Abstract
Abstract Crystal-structure refinements were done on Li-bearing muscovite-2M1 crystals from microgranite and granitic pegmatite rocks in order to characterize their crystal chemistry and their relationships with muscovite and trioctahedral lithium-containing micas. In addition to the substitution mechanism [6]Li+ [6]Al3+−1[4]Al3+−2[4]Si4+2, Li-bearing muscovite shows additional substitutions, such as mechanism [6]Li+ [6]Fe2+ [6]Al3+−1[6]□ −1, indicating that the structure deviates from ideal dioctahedral character. Single-crystal X-ray-diffraction data were collected for five crystals in space group C2/c; the agreement factor, Robs, varies between 0.033 and 0.042. The mean tetrahedral cation–oxygen atom distances range from 1.637 to 1.646 Å and from 1.629 to 1.647 Å for T1 and T2 sites, respectively. Variation in &lt;T–O&gt; distances is associated with the Li+/(Li+ + Al3+) ratio, octahedral M2 site expansion (9.30 ≤ volumeM2 ≤ 9.90 Å3) and reduction in size of the M1 site. Moreover, as the Li+/(Li+ + Al3+) ratio increases, the silicate ring becomes less distorted (5.9 ≤ α ≤ 11.4°), the basal oxygen-atom planes become less corrugated (0.147 ≤ Δz ≤ 0.232 Å), and the interlayer separation narrows (3.337 ≤ interlayer separation ≤ 3.422 Å).
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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) | 0.001 | 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