THE CRYSTAL STRUCTURE OF YOSHIMURAITE, A LAYERED Ba-Mn-Ti SILICOPHOSPHATE, WITH COMMENTS ON FIVE-COORDINATED Ti4+
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Bibliographic record
Abstract
The crystal structure of yoshimuraite, ideally Ba2Mn2TiO(Si2O7)(PO4)(OH), has been determined and refined to residuals of R = 3.0 % and wR = 4.1 % using material from the Taguchi mine, Aichi Prefecture, Honshu, Japan. It is triclinic, P¯1, with cell parameters a 5.386(1), b 6.999(1), c 14.748(3) Å, a 89.98(1), b 93.62(2), g 95.50(2)%, V 552.3(1) Å3, with Z = 2. The mineral is strongly layered on (001), consisting of two quasi-tetrahedral layers composed of TiO5 polyhedra cross-linked by corner-sharing (Si2O7) clusters. These layers bound on two sides a layer of closest-packed Mnf6 octahedra, thus forming a composite unit reminiscent of that found in 2:1 phyllosilicates. Such composite units are subsequently linked along [001] via an interlayer-like [Ba2(PO4)] sheet, the bonding between the two being relatively weak and resulting in the pronounced {001} cleavage ob-served in the mineral. Yoshimuraite is a member of the BMn heterophyllosilicate polysomatic series [specifically, the BM0 poly-some series], which includes phases such as astrophyllite, bafertisite and seidozerite.
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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 | 0.001 | 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) | 0.002 | 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