CRYSTAL CHEMISTRY OF MERCURY SULFOSALTS – GALKHAITE, (Hg<sub>5+<i>x</i></sub>Cu<sub>1–<i>x</i></sub>)Cs<sub>1–<i>x</i></sub>As<sub>4</sub>S<sub>12</sub>(<i>x</i>≈ 0): CRYSTAL STRUCTURE AND REVISION OF THE CHEMICAL FORMULA
Bibliographic record
Abstract
Three specimens of galkhaite from the Getchell mine (G), Nevada, USA; the Gal-Khaya As-Hg-Sb deposit (Gk), Yakutia, Russia; and Signols (S), Piedmont, Italy, have been fully characterized through single-crystal X-ray diffraction and electronmicroprobe analyses. Chemical data indicate the formulae [(Hg4.61Zn0.38Fe0.04)Σ5.03(Cu1.03Ag0.04)Σ1.07]Σ6.10(Cs0.76Tl0.20)Σ0.96(AS3.81Sb0.04)Σ3.85S12.06 (G), [(Hg4.66Zn0.32)Σ4.98(Cu0.55Ag0.45)Σ1.00]Σ5.98(Cs0.74Tl0.06(As3.42Sb0.56)Σ3.98S12.05 (Gk), and [(Hg4.10Zn0.85)Σ4.95(Cu0.89Ag0.16)Σ1.05]Σ6.00Cs0.95As3.64Sb0.16)Σ3.80 S12.19 (S). Unit-cell parameters are a 10.405(3) Å (G), 10.443(1) Å (Gk), and 10.332(2) Å (S), space group I4 ̄3m. The crystal structure of the three specimens has been solved to R1 = 0.029 (G), 0.028 (Gk), and 0.031 (S). It is a three-dimensional framework of HgS4 and AsS3 polyhedra, with Cs hosted in large 12-fold coordinated cavities. The introduction of Cs+, as well as minor Tl+ , at these structural positions requires the replacement of Hg2+ by Cu+ . The mixed site occupancy at the Hg site of galkhaite is a case of valency-imposed double site-occupancy. Consequently, the idealized chemical formula of galkhaite can be written as (Hg5Cu)CsAs4S12. Taking into account the possible existence of vacancy in the structural cavities, the formula can be generalized as (Hg5+xCu1-x)Σ6Cs1-xAs4S12 (x ≈ 0).
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".