JOHILLERITE FROM TOLBACHIK, KAMCHATKA PENINSULA, RUSSIA: CRYSTAL-STRUCTURE REFINEMENT AND CHEMICAL COMPOSITION
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Bibliographic record
Abstract
Johillerite from a fumarole in the North Breach of the Great Fissure Tolbachik eruption (GFTE), Kamchatka Peninsula, Russia, monoclinic, a 6.7520(14), b 12.739(3), c 11.068(2) A, β 100.37(3)°, V 936.4(2) A3, I 2/ a , Z = 4 has been refined to an R 1 value of 3.2% for 1175 observed (| F o| ⋄ 4σ F ) reflections measured with a Bruker P 4 diffractometer equipped with a CCD detector. The crystal used for the collection of the X-ray intensity data was subsequently analyzed with an electron microprobe; the resulting structural formula is Na0.77 K0.03 Pb0.01 Ca0.01 Mn0.01 2+ Zn0.13 Mg2.18 Cu1.55 2+ Fe0.26 3+ Al0.06 (As2.96 5+ P0.04) O12. The unusual feature of the johillerite structure is the A (1)’ site, a square-planar-coordinated site fully occupied by Cu2+, that is displaced ¼ along x. The A (2) site is similar to that in other alluaudite-group minerals, surrounded by eight O-atoms with a distance of 2.70 A, and occupied by Na plus small amounts of other large cations. The refined site-scattering values and observed distances at the M (1) and M (2) sites are in accord with occupancy primarily by Mg, with Cu2+ at M (1) and Cu2+ + Fe3+ + Al at M (2). Relative to the compositions of the arsenate minerals arseniopleite and caryinite, Cu2+ has replaced Ca in the formula of johillerite. In arseniopleite and caryinite, Ca (+ Na) at the A (1) site is [7]- or [8]-coordinated, and the resulting sites occur in chains of edge-sharing coordination polyhedra extending in the a direction. Rather than replacing Ca at the center of the A (1) polyhedron, Cu2+ in johillerite occurs close to the edge shared between adjacent polyhedra, adopting square-planar coordination that is common for Cu2+.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 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 it