THE CRYSTAL STRUCTURE OF SKIPPENITE, Bi2Se2Te, FROM THE KOCHKAR DEPOSIT, SOUTHERN URALS, RUSSIAN FEDERATION
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Bibliographic record
Abstract
Skippenite, Bi2Se2Te, was found in a sample from the Kochkar deposit, southern Urals, Russian Federation. The sample forms part of the mineralogical collection of the Natural History Museum of the University of Florence. Electron-microprobe analyses gave the chemical formula (Bi2.06Cu0.05Sb0.03)2.14Se2.00(Te0.89S0.11). The mineral occurs as anhedral grains up to 0.3 mm across. Skippenite is steel-grey in color, shows a black streak, and has a perfect basal cleavage. In reflected light, the mineral is greyish white, weakly bireflectant, nonpleochroic, moderately anisotropic in yellowish tints. Reflectivity values (Rmin and Rmax, in %) are 47.8, 48.1 (471.1 nm), 49.0, 50.2 (548.3 nm), 49.1, 50.3 (586.6 nm), and 49.3, 50.7 (652.3 nm), respectively. Skippenite is trigonal, space group R¯3m, with the following unit-cell parameters: a 4.183(1), c 29.137(3) Å, V 441.5(2) Å3 and Z = 3. The crystal structure has been refined to R = 2.93%. It consists of hexagonal close-packed sheets of Bi, Se and Te, respectively. The
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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