Crystal-structure refinement of a Zn-rich kupletskite from Mont Saint-Hilaire, Quebec, with contributions to the geochemistry of zinc in peralkaline environments
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Bibliographic record
Abstract
Abstract The chemistry and crystal structure of a unique Zn-rich kupletskite: (K 1.55 Na 0 .21 Rb 0.09 Sr 0.01 ) Σ1.86 (Na 0.82 Ca 0.18 ) Σ1.00 (Mn 4.72 Zn 1.66 Na 0.41 Mg 0.12 ) Σ7.00 (Ti 1.85 Nb 0.11 Hf 0.03 ) Σ1.99 (Si 7.99 Al 0.12 ) Σ8.11 O 26 (OH) 4 (F 0.77 OH 0.23 ) Σ1.00 , from analkalin e pegmatite at Mont Saint-Hilaire, Quebec, Canada has been determined. Zn-rich kupletskite is triclinic, , a = 5.3765(4), b = 11.8893(11), c = 11.6997(10), α = 113.070(3), β = 94.775(2), γ = 103.089(3), R 1 = 0.0570 for 3757 observed reflections with F o > 4σ( F o ). From the single-crystal X-ray diffraction refinement, it is clear that Zn 2+ shows a preference for the smaller, trans M (4) site (69%), yet is distributed amongst all three octahedral sites coordinated by 4 O 2− and 2 OH − [ M (2) 58% and M (3) 60%]. Of note is the lack of Zn in M (1), the larger and least-distorted of the four crystallographic sites, with an asymmetric anionic arrangement of 5 O 2− and 1 OH − . The preference of Zn for octahedral sites coordinated by mixed ligands (O and OH) is characteristic of its behaviour in alkaline systems, in contrast to granitic systems where Zn tends to favour [4]-coordinated, OH− and H 2 O-free sites with only one ligand species (O, S, Cl, B, I). In alkaline systems, [4] Zn is only present in early sphalerite or in late-stage zeolite-like minerals. The bulk of Zn in alkaline systems is present as discrete [6] Zn phases such as members of the astrophyllite, labuntsovite, milarite and nordite groups, a result of the formation of network-forming complexes inthe low-temperature, low- f S 2 , high-alkalinity and highly oxidizing systems.
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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 | 0.000 | 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) | 0.002 | 0.000 |
Machine scores (provisional)
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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