The crystal structure of munakataite, Pb<sub>2</sub>Cu<sub>2</sub>(Se<sup>4+</sup>O<sub>3</sub>)(SO<sub>4</sub>)(OH)<sub>4</sub>, from Otto Mountain, San Bernardino County, California, USA
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Bibliographic record
Abstract
Abstract Munakataite, Pb 2 Cu2(Se 4+ O 3 )(SO 4 )(OH) 4 , has been found in association with a variety of rare secondary Te minerals at Otto Mountain, San Bernardino County, California, USA. It is very rare and occurs as subparallel bundles of blue needles up to 1 mm long. Electron microprobe analyses provided the empirical formula Pb 1.96 Cu 1.60 [(Se 0.89 4+ S 0.11 ) ∑1 O 3 ](SO 4 )[(OH) 3.34 (H 2 O) 0.66 ] ∑4 - Munakataite is mono-clinic, space group P 2 1 / m , with cell parameters a = 9.8023(26), b = 5.6751(14), c = 9.2811(25) Å, β = 102.443(6), V = 504.2(2) Å 3 and Z = 2. The crystal structure, solved by direct methods and refined to R 1 = 0.0308 for 544 F o > 4σ F reflections, consists of Jahn-Teller-distorted Cu 2+ O 6 square bipyramids. which form chains along b by sharing trans edges across their square planes. The chains are decorated by SO 4 tetrahedra and Se 4+ O 3 pyramids, which bond to apical corners of adjacent bipyramids. The chains are linked to one another via bonds to two different PbO 9 polyhedra, only one of which exhibits one-sided coordination typical of Pb 2+ with a stereochemically active 6s 2 lone-electron-pair. Munakataite is isostructural with schmiederite and the structure is closely related to that of linarite.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.001 | 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 it