THE STRUCTURE OF PRICEITE, A BASIC HYDRATED CALCIUM BORATE, BY AB INITIO POWDER-DIFFRACTION METHODS
Bibliographic record
Abstract
The crystal structure of priceite, data and refined to Rwp = 0.042 and Rp = 0.030 using the Rietveld method. The monoclinic structure was refined in space group P21/c, a 11.623(1), b 6.976(1), c 12.350(1) Å, β 110.70(1)°, V936.72(1) Å3, Z = 4. The structure consists of infinite chains of pairs of borate rings that extend along [100] via corner-sharing; three corner-linked BΦ4 (Φ: OH-, O2-, or H2O) tetrahedra form one ring linked through a common boron atom to the next ring, composed of two BΦ4 tetrahedra and one BΦ3 triangle. Chains of edge-sharing CaΦ8 polyhedra zigzag along [010]. The borate chains are cross-linked by CaΦ8 polyhedra via edge- and corner-sharing. There are three borates in addition to priceite, that contain a <3B>-<3B> chain motif, but priceite is the only one containing a 3□ ring. These chains extend perpendicular to the calcium chains of polyhedra, in contrast to colemanite, which displays a <3B> motif where the strings are parallel.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.008 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".