THE CRYSTAL STRUCTURE OF Cu1.6Pb1.6Bi6.4S12, A NEW 44.8 A DERIVATIVE OF THE BISMUTHINITE-AIKINITE SOLID-SOLUTION SERIES
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Bibliographic record
Abstract
The crystal structure of Cu 1.60 Pb 1.62 Bi 6.38 S 11.97 , idealized Cu 1.6 Pb 1.6 Bi 6.4 S 12 , a new derivative of the aikinite–bismuthinite series from the metamorphosed scheelite deposit of Felbertal, Austria, with a 4.0074(9), b 44.81(1), c 11.513(3) A, space group Pmc 2 1 , Z = 4, has been solved by direct methods and difference Fourier syntheses to a residual R value of ~4.7%. The unit cell of this “four-fold derivative” contains two “bismuthinite-like” Bi 2 S 3 ribbons and six “krupkaite-like” CuPbBi 3 S 6 ribbons. The fully occupied Cu sites occur in zigzag [001] rows Δ y ≈ 0.25 apart; the third [001] row, in which the Cu sites are 71% occupied, is Δ y ≈ 0.375 apart from them. The latter interval hosts a strongly zigzag pattern of 10% occupied Cu sites. Coordination polyhedra have been analyzed using the polyhedron-distortion parameters devised recently by Balic-Žunic & Makovicky. Cu 1.6 Pb 1.6 Bi 6.4 S 12 occurs at Felbertal both as independent grains and as a component of exsolution pairs.
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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.
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