The crystal structure and crystal chemistry of mendeleevite-(Ce), (Cs,☐)<sub>6</sub>(☐,Cs)<sub>6</sub>(☐,K)<sub>6</sub>(REE,Ca,☐)<sub>30</sub>(Si<sub>70</sub>O<sub>175</sub>)(H<sub>2</sub>O,OH,F,☐)<sub>35</sub>, a potential microporous material
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Bibliographic record
Abstract
Abstract The crystal structure of mendeleevite-(Ce), (Cs,☐) 6 (☐,Cs) 6 (☐,K) 6 (REE,Ca,☐) 6 (Si 70 O 175 ) (H 2 O,OH,F,D) 35 , a new mineral from the moraine of the Darai-Pioz glacier, the Alai mountain ridge. Tien-Shan mountains, northern Tajikistan, was solved by direct methods and refined to Ri = 4.15% based on 2274 observed [F o > 4σ|F|] unique reflections measured with Mo-Kα. radiation on a Bruker PA diffractorneter equipped with a CCD detector. Mendeleevite-(Ce) is cubic, space group Pm3̄, a 21.9148(4) Å, V 10525(1) Å 3 , Z = 2, D calc = 3.066 g/cm 3 . The empirical formula (electron microprobe) is CS 5.94 K 2.22 [(Ce 11.35 La 5.86 Nd 3.23 Pr 1.54 Sm 0.32 Gd 0.20 ) Σ22.50 (Ca 4.68 Sr 1.00 ) Σ5.68 ] Σ28.18 Si 70.12 O 203.17 H 45.67 F 6.83 , Z = 2, calculated on the basis of 210 (O + F) a.p.f.u., with H 2 O and OH calculated from structure refinement (OH + F = 17 p.f.u.; H 2 O = 17.75 p.f.u.). The structural formula is (Cs 4.65 ☐ 1.35 ) Σ6 (☐ 4.71 Cs 1.29 ) Σ6 (☐ 3.78 K 2.22 ) Σ6 ﹛[(Ce 11.35 La 5.86 Nd 3.23 Pr 1.54 Sm 0.32 Gd 0.20 ) Σ22.50 (Ca 4.68 Sr 1.00 ) Σ5.68 ] Σ28.18 ☐ 1.82 ﹜ Σ30 (Si 70 O 175 )[(OH) 10.17 F 6.83 ] Σ17 (H 2 O) 17.75 . Simplified and endmember formulae are as follows: (Cs,☐) 6 (☐,Cs) 6 (☐,K) 6 (REE,Ca,☐) 30 (Si 70 O 175 ) (H 2 O,OH,F,☐) 35 and Cs 6 (REE 22 Ca 6 )(Si 70 O 175 )(OH,F) 14 (H 2 0) 21 . The crystal structure of mendeleevite-(Ce) is an intercalation of two independent Si—O radicals and an M framework of (REE,Ca) polyhedra. The Si—O radicals are an (Si 140 O 260 ) 104– framework and an (Si 36 O 90 ) 36– cluster which do not link directly. The M framework is located between the Si—O framework and the Si—O clusters. Interstitial cations occupy two types of cages and channels. Cages I and II are 78 and 22% occupied by Cs. Channels along [100↻] contain K atoms and H 2 O groups. Mendeleevite-(Ce) has no natural or synthetic structural analogues. Mendeleevite-(Ce) is a framework mineral with large cavities and it has the potential to be used as a model for the synthesis of microporous materials of industrial interest.
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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 | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.008 | 0.007 |
| Meta-epidemiology (broad) | 0.008 | 0.003 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.004 | 0.007 |
| Scholarly communication | 0.004 | 0.003 |
| Open science | 0.006 | 0.006 |
| Research integrity | 0.005 | 0.005 |
| Insufficient payload (model declined to judge) | 0.001 | 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 it