A BOND-VALENCE APPROACH TO THE STRUCTURE, CHEMISTRY AND PARAGENESIS OF HYDROXY-HYDRATED OXYSALT MINERALS. II. CRYSTAL STRUCTURE AND CHEMICAL COMPOSITION OF BORATE MINERALS
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Bibliographic record
Abstract
The crystal structures and chemical compositions of hydroxy-hydrated borate oxysalt minerals are interpreted in terms of the bond-valence approach to the structure and chemistry of oxysalts developed by Schindler & Hawthorne (2001). The grand mean Lewis basicity of structural units in hydroxy-hydrated borate minerals is 0.21 vu . For stable structures to occur, the Lewis acidities of the interstitial complexes must match this value on average. Hence the percentage of transformer (H 2 O) groups in borate minerals is strongly positively correlated with the Lewis basicity of the interstitial cation(s), a direct result of the valence-matching principle. Thus on average, interstitial Mg must bond to transformer (H 2 O) groups, whereas interstitial Na will not bond to transformer (H 2 O) groups. Detailed predictions of the compositions of interstitial complexes are developed for the structural units [B 3 O 3 (OH) 5 ] 2− , [B 4 O 5 (OH) 4 ] 2− and [B 6 O 7 (OH) 6 ] 2− , and these predictions are in accord with the chemical compositions of inderite, inderborite, inyoite, meyerhofferite, tincalconite, borax, hungchaoite, rivadavite, mcallisterite, admontite and aksaite. General predictions for Cl-free hydroxy-hydrated borate minerals lead to accurate prediction of coordination number of interstitial cations in 90% of the minerals, and 95% have the observed amount of transformer (H 2 O) groups within the predicted range for each mineral. This agreement between the predicted and observed values suggests that the general argument developed by Schindler & Hawthorne (2001) is physically realistic and should be applicable to oxysalt minerals in general.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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