THE STRUCTURE OF PRICEITE, A BASIC HYDRATED CALCIUM BORATE, BY AB INITIO POWDER-DIFFRACTION METHODS
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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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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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