THE CRYSTAL STRUCTURE OF NEYITE, Ag2Cu6Pb25Bi26S68
Bibliographic record
Abstract
The crystal structure of type neyite from Alice Arm, British Columbia, was determined from single-crystal X-ray diffraction data with the agreement factors R 1 = 0.037 (0.072 for all) and ω R 2 = 0.078. The structural formula supported by the new electron-microprobe data is AgCu 3 Pb 12.5 Bi 13 S 34 ( Z = 4); the lattice parameters are a 37.527(6), b 4.0705(6), c 43.701(7) A, β 108.801(2)°, space group C 2/m . The structure contains 26 independent large-cation polyhedra, one Ag site and three Cu sites. It can be described as an alternation of triple-octahedron (111) PbS -like layers with (100) PbS -like layers two atomic planes thick. Both sets of layers are (a) sheared, giving rise to tetrahedral Cu sites, and (b) truncated by wavy PbS-like layers (001) ney , three atomic planes thick. The resulting structure can be described as a box-work of (100) PbS -like layers enclosing (111) PbS -like fragments. Several hypothetical structures based on the neyite principle have been derived.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".