THE CRYSTAL STRUCTURE OF LENINGRADITE, PbCu3(VO4)2Cl2
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Bibliographic record
Abstract
The crystal structure of leningradite, PbCu 3 (VO 4 ) 2 Cl 2, a mineral from the fumaroles of the Great fissure Tolbachik eruption, located in the Kamchatka Peninsula, Russia, has been solved by direct methods from single-crystal X-ray-diffraction data and refined to R 1 = 0.047 for 1235 unique reflections with | F o | ≥ 4σ F . The mineral is orthorhombic, space group Ibam , a 9.005(7), b 11.046(9), c 9.349(7) A, V 929.9(13) A 3 , Z = 4. The structure contains one symmetrically unique Pb position coordinated by four O and four Cl atoms. The V 5+ cation is tetrahedrally coordinated by four O atoms. There are two symmetrically independent Cu sites in distorted octahedral [4O + 2Cl] coordination. The structure can be described in terms of fundamental chains consisting of corner-sharing CuO 4 squares and VO 4 tetrahedra. The chains are parallel to the c axis and are linked into a three-dimensional framework with elliptical channels occupied by the Pb 2+ cations and Cl − anions.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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.
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