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
Why this work is in the frame
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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 [(Hg<inf>4.61</inf>Zn<inf>0.38</inf>Fe<inf>0.04</inf>)<inf>Σ5.03</inf>(Cu<inf>1.03</inf>Ag<inf>0.04</inf>)<inf>Σ1.07</inf>]<inf>Σ6.10</inf>(Cs<inf>0.76</inf>Tl<inf>0.20</inf>)<inf>Σ0.96</inf>(AS<inf>3.81</inf>Sb<inf>0.04</inf>)<inf>Σ3.85</inf>S<inf>12.06</inf> (G), [(Hg<inf>4.66</inf>Zn<inf>0.32</inf>)<inf>Σ4.98</inf>(Cu<inf>0.55</inf>Ag<inf>0.45</inf>)<inf>Σ1.00</inf>]<inf>Σ5.98</inf>(Cs<inf>0.74</inf>Tl<inf>0.06</inf>(As<inf>3.42</inf>Sb<inf>0.56</inf>)<inf>Σ3.98</inf>S<inf>12.05</inf> (Gk), and [(Hg<inf>4.10</inf>Zn<inf>0.85</inf>)<inf>Σ4.95</inf>(Cu<inf>0.89</inf>Ag<inf>0.16</inf>)<inf>Σ1.05</inf>]<inf>Σ6.00</inf>Cs<inf>0.95</inf>As<inf>3.64</inf>Sb<inf>0.16</inf>)Σ3.80 S<inf>12.19</inf> (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 R<inf>1</inf> = 0.029 (G), 0.028 (Gk), and 0.031 (S). It is a three-dimensional framework of HgS<inf>4</inf> and AsS<inf>3</inf> polyhedra, with Cs hosted in large 12-fold coordinated cavities. The introduction of Cs<sup>+</sup>, as well as minor Tl<sup>+</sup> , at these structural positions requires the replacement of Hg<sup>2+</sup> by Cu<sup>+</sup> . 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 (Hg<inf>5</inf>Cu)CsAs<inf>4</inf>S<inf>12</inf>. Taking into account the possible existence of vacancy in the structural cavities, the formula can be generalized as (Hg<inf>5+x</inf>Cu<inf>1-x</inf>)<inf>Σ6</inf>Cs<inf>1-x</inf>As<inf>4</inf>S<inf>12</inf> (x ≈ 0).
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| 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