THE CRYSTAL STRUCTURE OF HUBEITE, A NOVEL SOROSILICATE MINERAL
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Bibliographic record
Abstract
The crystal structure of hubeite, Ca2 Mn 2+ Fe 3+ (Si4 O12 (OH)) (H2O)2, triclinic, space group Pa 9.9653(3), b 13.9171(3), c 6.5703(2) A, 133.264(1), 101.414(1), 66.302(1)°, V 603.47(6) A 3 , Z = 2, has been solved by direct methods and has been refined to an R index of 2.2% based on 2875 observed (5) reflections measured with MoK X-radiation. There are two Ca sites, one (8)- and one (7)-coordinated, with (: O, OH, H2O) distances of 2.527 and 2.485 A, respectively. There is one Mn site octahedrally coordinated by five O-atoms and one (OH) group, with a distance of 2.224 A, indicating occupancy of this site by Mn 2+ . There is one Fe site octahedrally coordinated by O-atoms, with an distance of 2.025 A, indicating occupancy of this site by Fe 3+ . There are four Si sites, each occupied solely by Si, with a distance of 1.627 A. One of the silicate tetrahedra is an acid silicate group: SiO3(OH). The four Si tetrahedra link by sharing corners to form a linear (Si413) group, and hence hubeite is a sorosilicate. The overall structure consists of layers of (Si413) groups alternating with layers of edge-sharing (6)-, (7)- and (8)-coordinated Ca, Mn 2+ and Fe 3+ polyhedra parallel to (001). These layers stack in the (001) direc- tion, forming a framework with tunnels that extend along (001) and contain the isolated (H2O) groups. The structure of hubeite is related to the structures of inesite, rhodonite and babingtonite.
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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) | 0.000 | 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