THE CRYSTAL CHEMISTRY OF Li-BEARING MINERALS WITH THE MILARITE-TYPE STRUCTURE: THE CRYSTAL STRUCTURE OF END-MEMBER SOGDIANITE
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].
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".