TISCHENDORFITE, Pd8Hg3Se9, A NEW MINERAL SPECIES FROM TILKERODE, HARZ MOUNTAINS, GERMANY
Bibliographic record
Abstract
Tischendorfite, ideally Pd8Hg3Se9, is a new mineral species from the Eskaborner Stollen (Eskeborn Adit) at Tilkerode, Harz Mountains, Germany. It occurs as aggregates in a carbonate matrix, together with the associated metallic minerals clausthalite, tiemannite, chrisstanleyite, stibiopalladinite and gold. It is opaque with a metallic luster, has a black streak, is brittle, and the fracture is uneven. In plane-polarized reflected light, tischendorfite has a cream or slightly beige color in association with chrisstanleyite (light buff to slightly gray-green buff), clausthalite (off-white) and tiemannite (gray). It is not pleochroic, and displays a weak bireflectance. It does not possess internal reflections. The anisotropy is weak to moderate, with rotation tints in weak shades of steel blue and greenish brown. Reflectance data and color values are tabulated. Average results of four electron-microprobe analyses are: Pd 39.4, Pt 0.1, Ag 1.0, Cu 0.2, Hg 24.9, Pb 1.4, Se 32.0, total 99.0 wt.%. The empirical formula, (Pd8.05Pt0.01)∑8.06(Hg2.70Ag0.20Pb0.15Cu0.07) ∑3.12Se8.82, is based on 20 atoms per formula unit. The calculated density is 9.13 g/cm3 (on the basis of the empirical formula and unit-cell parameters refined from powder data). Tischendorfite is orthorhombic, with a 7.219(3), b 16.782(7), c 6.467(5) A, V 783.6(8) A3, a:b:c 0.4302:1:0.3854, and Z = 2. The probable space-groups are Pmmn (59), P 21 mn (31) or Pm 21 n (31) (diffraction aspect P ** n ). The strongest seven X-ray powder-diffraction lines [ d in A( I )( hkl )] are: 4.819(40)(101), 4.373(40)(130), 2.797(60)(032,122), 2.743(100)(151,231,240), 2.325(40)(052), 2.116(40)(062) and 2.091(100)(261). The mineral’s name honors Gerhard Tischendorf, geochemist and mineralogist, in recognition of his contributions to understanding the genesis of selenide mineral deposits.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.051 | 0.003 |
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; both teacher heads agree on what is shown here.
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".