The crystal structure of zigrasite, MgZr(PO<sub>4</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>, a heteropolyhedral framework structure
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Bibliographic record
Abstract
Abstract The crystal structure of zigrasite, ideally MgZr(PO 4 ) 2 (H 2 O) 4 , a 5.3049(2), b 9.3372(4), c 9.6282(5) Å, α 97.348(1)°, β 91.534(1)°, γ 90.512(4)°, V 472.79(5) Å 3 , Z = 2, triclinic, P 1 , D calc. 2.66 g.cm –3 , from the giant 1972 pocket at Newry, Oxford County, Maine, USA, has been solved and refined to R 1 3.75% on the basis of 2623 unique reflections ( F o > 4σ F ). There are two P sites, each of which is solely occupied by P with <P–O> distances of 1.532 and 1.533 Å, respectively. There are two Mg sites, both of which are occupied by Mg and are octahedrally coordinated two O anions and four (H 2 O) groups with <Mg–O> distances of 2.064 and 2.075 Å, respectively. There is one Zr site, occupied by Zr and octahedrally coordinated by six O anions with a <Zr–O> distance of 2.065 Å . The (ZrO 6 ) octahedron shares corners with six (PO 4 ) tetrahedra, forminga [Zr(PO4) 2 ] sheet parallel to (001). These sheets are stacked in the c direction and linked by (MgO 2 (H 2 O) 4 ) octahedra that share O atoms with the (PO 4 ) groups. The structure is formally a heteropolyhedral framework structure, but the linkage is weaker in the c direction, accounting for the marked (001) cleavage.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.003 |
| 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