SELENOJALPAITE, Ag3CuSe2, A NEW MINERAL SPECIES FROM THE SKRIKERUM Cu Ag Tl SELENIDE DEPOSIT, SMALAND, SOUTHEASTERN SWEDEN
Bibliographic record
Abstract
Selenojalpaite, ideally Ag3CuSe2, is a very rare mineral newly identifi ed at the Skrikerum Cu–Ag–Tl selenide deposit, near Valdermarsvik, Smaland, southeastern Sweden. It occurs as dark grey anhedral to subhedral grains up to 200 m across, closely associated with eucairite, altaite, berzelianite and chalcopyrite. Selenojalpaite is opaque with a metallic luster; it possesses a black streak. It is brittle with an uneven fracture; the Vickers microhardness (VHN25) is 37 kg/mm 2 (range 36–40), equivalent to a Mohs hardness of 4–4½. The calculated density is 7.64 g/cm 3 (on the basis of the empirical formula). In plane-polarized refl ected light, selenojalpaite is light grey, weakly to moderately birefl ectant, and weakly pleochroic from brownish grey to a slightly darker greenish grey. Between crossed polars, it is anisotropic, without characteristic rotation-tints or internal refl ections. Values of refl ectance in the range 400–700 nm are tabulated; values of Rmin and Rmax for the four standard COM wavelengths are 33.5, 37.1 (471.1 nm), 31.8, 35.1 (548.3 nm), 30.4, 34.0 (586.6 nm), and 29.3, 32.4 (652.3 nm), respectively. Its unit-cell parameters were derived by comparison with jalpaite, Ag3CuS2, which shows strong chemical and crystallographic similarities. Selenojalpaite is tetragonal, probable space-group I41/amd, with unit-cell parameters refi ned from powder data: a 8.939(1), c 11.844(2) A, V 946.4(2) A 3 , c : a 1.3250, Z = 8. The strongest seven powder-diffraction lines [d in A(I)(hkl)] are: 4.47(60)(200),
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| 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".