Lamellar minerals of the cuprobismutite series and related paderaite: a new occurrence and implications. The Canadian Mineralogist
Bibliographic record
Abstract
An assemblage consisting of bismuthinite derivatives, mainly in the range gladite – oversubstituted bismuthinite (Cu0.833Pb0.833Bi19.167S30), makovickyite, and intergrowths of cuprobismutite and paděraite, with minor hodrushite, occurs in the Paulus mine, Ocna de Fier skarn deposit, southwestern Romania. Even though intimately intergrown with one another as sets of lamellae of varying thickness, with back-scattered electron images strongly suggesting that lamellar intergrowths of the two minerals extend below the size of the microprobe beam, homogeneous parts of lamellae or well-developed acicular crystals allow compositional characterization of the components. These are cuprobismutite, Cu8.07(Ag0.99Pb0.21Bi12.72)13.92S24.01, paděraite, Cu7.11(Ag0.36Pb1.20)1.56Bi11.28S22.05, and hodrushite, (Cu7.80Fe0.23)8.03(Ag0.35Pb0.12Cd0.02Bi11.49)11.98S21.99. Hodrushite is the least abundant component, containing minor but persistent Fe, up to 0.41 wt.%. An inverse correlation between Ag and Pb is seen between cuprobismutite (Agmin 2.34 wt.%, Agmax 2.75 wt.%) and paděraite (Pbmin 5.37 wt.%, Pbmax 7.34 wt.%). Compositions for each phase diverge somewhat from previously published data, suggesting that varying degrees of incorporation of Ag and, to a lesser extent, Pb, are features of the cuprobismutite homologous series and of the related paděraite. Ag appears to be an essential component of cuprobismutite, our data showing that 1 apfu Ag occupies the Bi position (14 apfu). Hodrushite differs from the type-locality material (Cu8.12Fe0.29Bi11.54S22), showing that the composition can depart from the ideal compositions within certain limits, with incorporation of Ag, Pb and Fe in the structure. Significantly, the number of Cu atoms is less than 8 apfu in the Ocna
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How this classification was reachedexpand
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 | 0.000 | 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".