From Structure Topology To Chemical Composition. XXII. Titanium Silicates: Revision of the Crystal Structure of Jinshajiangite, NaBaFe<sup>2+</sup><sub>4</sub>Ti<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>2</sub>F, A Group-II TS-Block Mineral
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Bibliographic record
Abstract
Abstract The crystal structure of jinshajiangite from the Verkhnee Espe deposit, Kazakhstan, NaBaFe 2+ 4 Ti 2 (Si 2 O 7 ) 2 O 2 (OH) 2 F, was refined from a twinned crystal to R 1 = 3.13% on the basis of 6745 unique reflections [ F o > 4σ F o ], space group , Z = 8, a 10.7059(5), b 13.7992(7), c 20.760(1) A, α 90.008(1), β 94.972(1), γ 89.984(1)°, V 3055.4(4) A 3 . The crystal used for the structure refinement was analyzed by electron microprobe. The empirical formula was calculated on 19 (O + F), with (OH + F) = 3 pfu : (Na 0.77 Ca 0.23 ) Σ1 (Ba 0.60 K 0.36 ) Σ0.96 (Fe 2+ 2.33 Fe 3+ 0.26 Mn 1.26 Zr 0.04 Mg 0.02 Zn 0.01 ) Σ3.92 (Ti 1.79 Nb 0.18 Mg 0.02 Al 0.01 ) Σ4 (Si 2 O 7 ) 2 O 3.93 H 1.93 F 1.07 , Z = 8; Fe 2 O 3 was calculated by analogy with jinshajiangite from Norra Karr, Sweden (Sokolova et al . 2009a) and H 2 O from the crystal-structure analysis. In the crystal structure, TS (Titanium Silicate) and I (Intermediate) blocks alternate along c . The TS block consists of HOH sheets (H-heteropolyhedral, O-octahedral). The topology of the TS block is as in Group II of the TS-block minerals where Ti (+ Nb) = 2 apfu . In the O sheet, ten [6] M O sites are occupied mainly by Fe 2+ , with O –φ> = 2.181 A. In the H sheet, four [6] M H sites are occupied mainly by Ti, with H –φ> = 1.954 A, and eight [4] Si sites are occupied by Si, with = 1.622 A. The M H octahedra and Si 2 O 7 groups constitute the H sheet. Fluorine atoms and OH groups are ordered at the X P M (H sheet) and X O A (O sheet) sites, respectively. The TS blocks link via common vertices of M H octahedra, i.e ., M H –X P M – M H bridges. In the I block, Ba and K occur at the two A P sites, with Ba > K, and the two B P sites are occupied by Na and Ca, with Na > Ca. Jinshajiangite is isostructural with bobshannonite, Na 2 KBa(Nb,Ti) 4 Mn 8 (Si 2 O 7 ) 4 O 4 (OH) 4 (O,F) 2 , Z = 4.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.004 | 0.003 |
| Meta-epidemiology (broad) | 0.005 | 0.002 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.003 | 0.006 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.006 | 0.003 |
| Research integrity | 0.003 | 0.003 |
| 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