The question of water content in parsonsite: a model case - occurrence at the Červené žíly vein system, Jáchymov (St. Joachimsthal), Czech Republic
Bibliographic record
Abstract
Strongly altered gangue, containing rich crystalline aggregates of parsonsite, was recently found at the outcrop parts of the Červené žíly vein system, the Jáchymov ore district, Czech Republic.Mineralogical research proved that in the crystal structure of parsonsite from Jáchymov is present a higher content of molecular water than expected.This conclusion is supported by the results of thermogravimetric analysis and infrared spectroscopy.The weight loss obtained from TG curve is 3.70 wt.%, corresponding to 1.93 mols of H 2 O.The presence of a broad vibration band reflecting the O-H stretching vibrations of molecular water was ascertained in the infrared spectrum of studied parsonsite sample, suggesting that H 2 O molecules are involved in the hydrogen-bonding network in the crystal structure of studied parsonsite.Inferred hydrogen bond lengths can vary in the range 2.6-3.0Å, which is consistent with the distance between possible position of the molecular water and nearest neighbouring oxygen atom in the crystal structure of the synthetic parsonsite given in the literature.The chemical composition of the studied parsonsite from Jáchymov, 47.27 PbO, 13.38 P 2 O 5 , 1.60 As 2 O 5 , 0.16 SiO 2 , 32.61 UO 3 , 3.70 H 2 O, total 98.71 wt.%, can be expressed as Pb 1.99 (UO 2 ) 1.07 [(PO 4 ) 1.77 (AsO 4 ) 0.13 (SiO 4 ) 0.03 ] Σ1.93 .1.93 H 2 O, based on electron microprobe and thermal analyses.Its refined unit-cell parameters for triclinic space group P-1, a 6.860(2), b 10.404(3), c 6.665(3) Å, α 101.46(3)O, β 98.30(3) o , γ 86.29(2) o , V 461.0(3)Å 3 agree very well with the published data.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 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".