Ehrigite, Bi8Te3, a New Member of the Tetradymite Group
Bibliographic record
Abstract
Abstract Ehrigite, Bi8Te3, is a new member of the tetradymite group and crystallizes in the trigonal crystal system (space group: , #166). Its cell dimensions are a = 4.519(6) Å, c = 65.182(24) Å, Z = 3, and V = 1152.771(7.554) Å3. Ehrigite occurs as sub-100-micron-sized grains in hedenbergite skarn from the abandoned Good Hope gold mine, Hedley district, British Columbia, Canada. The mineral and name have been approved by the IMA Commission on New Minerals and Mineral Nomenclature (proposal 2023-074). Ehrigite is compositionally and structurally distinct from hedleyite, Bi7Te3, with which it coexists. Ehrigite is opaque, with a pale gray color in reflected light. Reflectance is higher than tetradymite and slightly higher than hedleyite. It appears gray against native bismuth. The ehrigite structure consists of a single 11-atom layer visualized in atomic-scale high-angle annular dark field scanning transmission electron microscope images and further constrained from ab initio total energy calculations and structure relaxation using density functional theory using the measured parameters as input data. Scanning transmission electron microscope simulations also closely match the crystal structure model and images. Phases of the tetradymite and related modular mineral groups are well suited to visualization, indexing, and diffraction using a high-angle annular dark field scanning transmission electron microscope. The addition of density functional theory methodology to corroborate and refine structural characteristics provides a valuable approach for understanding these complex yet predictable minerals.
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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 | 0.000 |
| 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) | 0.001 | 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".