CUPROMAKOVICKYITE, Cu8Pb4Ag2Bi18S36, A NEW MINERAL SPECIES OF THE PAVONITE HOMOLOGOUS SERIES
Bibliographic record
Abstract
Cupromakovickyite, ideally Cu 8 Pb 4 Ag 2 Bi 18 S 36 , is a new mineral species that occurs at the skarn deposit of Baiţa Bihor, Romania, and at the scheelite deposit Felbertal, Salzburg Province, Austria. The associated minerals are makovickyite, bismuthinite derivatives (aikinite–friedrichite range), hodrusite, kupcikite, padĕraite, emplectite, wittichenite and tetradymite (Baiţa Bihor), and makovickyite, bismuthinite derivatives (aikinite–krupkaite range), hodrusite, kupcikite, wittichenite and native bismuth (Felbertal). The opaque mineral is grey, has a metallic luster and is brittle without any discernable cleavage. The mean micro-indentation hardness is 295 kg/mm 2 , corresponding to a Mohs hardness of 4. In reflected light, it is grayish white; the bireflectance is weak, and the anisotropy is moderate in air and strong in oil. Internal reflections are absent. The reflectance data (air) are: 42.1, 48.5 at 470 nm, 41.0, 46.9 at 546 nm, 40.2, 45.8 at 589 nm and 39.6, 45.0% at 650 nm. The average results of five electron-microprobe analyses are: Cu 7.66(1), Ag 4.01(3), Pb 9.45(3), Bi 60.02(9), Se 0.30(1), Te 0.76(3), S 17.55(2), total 99.75(7) wt.%, corresponding to Cu 7.79 Ag 2.4 Pb 2.95 Bi 18.55 (Se 0.24 Te 0.39 S 35.37 ) ∑36 , calculated on the basis of ∑(S + Se + Te) = 36 atoms per formula unit. The simplified formula, Cu 8 Pb 4 Ag 2 Bi 18 S 36 , is in accordance with the empirical formula and that deduced from the crystal-structure analysis. The density, 6.78 g/cm 3 , was calculated using the ideal (structural) formula and Z = 1. Cupromakovickyite has a monoclinic cell with a 13.405(8), b 4.016(3), c 29.949(19) A, β 99.989(16)°, V 1587.8(17) A 3 , space group C 2/ m , and Z = 1. The strongest lines in the calculated powder-diffraction pattern [ d in A(I)( hkl )] are: 3.478(100)(114), 2.842(94)(312), 3.646(57)(206), 3.486(41)(208), 3.345(33)(402), 2.964(33)(310), 2.282(31)(1110). Its c dimension is double the length of the c dimension of makovickyite, the N = 4 member of the pavonite homologous series. Cupromakovickyite is closely structurally related to makovickyite. The name of the new mineral expresses this relationship. Both the mineral and its name were approved by the Commission on New Minerals and Mineral Names (IMA 2002–58).
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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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".