THE CRYSTAL STRUCTURE OF ANGELAITE, Cu2AgPbBiS4
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Bibliographic record
Abstract
The crystal structure of angelaite, ideally Cu 2 AgPbBiS 4 , a 12.734(5), b 4.032(1), c 14.633(5) A, V 751.2(5) A 3 , space group Pnma, Z = 4, D calc = 6.89 g.cm −3 , from the Angela mine, Los Manantiales district, province of Chubut, Argentina, has been solved by direct methods and refined to R 1 = 6.47% on the basis of 606 unique reflections [ F o > 4σ( F o )]; these were collected on a Bruker P3 diffractometer with a CCD detector and Mo K α radiation from a fragment consisting of an intergrowth of angelaite and galena. Angelaite contains a capped trigonal prismatic Pb site, a quasi-octahedral Bi site, a linearly coordinated Cu site, and three triangular sites, one occupied by Ag and two partially occupied by Cu. Angelaite is a homeotype of galenobismutite with the Pb and Bi1 sites of galenobismutite preserved, and the Bi2 site replaced by the combination of Ag and Cu sites described above, which represent a novel type of substitution: (Ag + + 2Cu + )-for-Bi 3+ . Selenium-free galenobismutite from Felbertal (Austria) was refined to the R 1 value of 2.49% to serve as a reference structure related to that of angelaite.
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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)
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