THE CRYSTAL CHEMISTRY OF Li-BEARING MINERALS WITH THE MILARITE-TYPE STRUCTURE: THE CRYSTAL STRUCTURE OF END-MEMBER SOGDIANITE
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Bibliographic record
Abstract
The crystal structure of end-member sogdianite from the Dara-i-Pioz alkaline massif, northern Tajikistan, a 10.1240(3), c 14.3198(5) Å, V 1271.1(1) Å3, space group P6/mcc, Z = 2, has been refined to an R index of 2.0 % using 576 observed (|Fo |> 4sF) reflections collected with single-crystal diffractometer with MoKa X-radiation. Electron-microprobe analysis gives a composi-tion (Zr1.98 Hf002)S2.00 (K0.99 Na0.01)S1.00 Li2.97 Si12.01 O30. The sogdianite end-member has the typical structure of the double-ring silicates of the milarite structure-type: the A octahedron and T(2) tetrahedron are completely occupied by Zr and Li, and tetrava-lent Zr at the A site induces the lack of Na at the B site. The simplified chemical formula Zr2 K Li3 Si12 O30 corresponds to the ideal end-member formula of sogdianite (Zr,Ti4+,Fe3+,Al)2 (M,Na)2 K [Li3Si12O30] with Zr dominant at the A site and M (vacancy) dominant at the B site: Zr2 M2 K [Li3 Si12 O30].
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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 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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