THE CRYSTAL STRUCTURE OF EMILITE, Cu10.7Pb10.7Bi21.3S48, THE SECOND 45 A DERIVATIVE OF THE BISMUTHINITE AIKINITE SOLID-SOLUTION SERIES
Bibliographic record
Abstract
The crystal structure of the new mineral species emilite, discovered in the Felbertal scheelite deposit, Austria [Cu10.7Pb10.7Bi21.3S48, Pmc 21, a 4.0285(8), b 44.986(9), c 11.599(2) A], reveals it to be a new 45 A member of the bismuthinite – krupkaite – aikinite solid-solution series. A refinement of the crystal structure was made with single-crystal measurements, which included 2943 observed unique reflections (I > 2σI) and resulted in R 1 = 6.6% ( R W = 22.4%). The crystal structure is composed of a fairly complex sequence of krupkaite-like and aikinite-like structure intervals. Emilite is structurally an analogue of the only other 45 A member of the series, salzburgite (Cu6.4Pb6.4Bi25.6S48). Where one structure has [001] rows of Cu-filled tetrahedra, the other has empty or half-empty tetrahedra, and vice versa . The oversubstitution of Cu in the krupkaite-like intervals in the structure causes a departure from an idealized Cu10Pb10Bi22S48 composition and might be required by a metric fit between the krupkaite and aikinite modules in the structure and thus be a prerequisite for its stabilization.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".