THE CRYSTAL STRUCTURE OF HUBEITE, A NOVEL SOROSILICATE MINERAL
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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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 | 0.000 | 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 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 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".