THE CRYSTAL STRUCTURE OF NEYITE, Ag2Cu6Pb25Bi26S68
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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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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)
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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