Byzantievite, Ba<sub>5</sub>(Ca,<i>REE</i>,Y)<sub>22</sub>(Ti,Nb)<sub>18</sub>(SiO<sub>4</sub>)<sub>4</sub>[(PO<sub>4</sub>),(SiO<sub>4</sub>)]<sub>4</sub> (BO<sub>3</sub>)<sub>9</sub>O<sub>21</sub>[(OH),F]<sub>43</sub>(H<sub>2</sub>O)<sub>1.5</sub>: the crystal structure and crystal chemistry of the only known mineral with the oxyanions (BO<sub>3</sub>), (SiO<sub>4</sub>) and (PO<sub>4</sub>)
Why this work is in the frame
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Bibliographic record
Abstract
Abstract The crystal structure of byzantievite, Ba 5 (Ca, REE ,Y) 22 (Ti,Nb) 18 (SiO 4 ) 4 [(PO 4 ),(SiO 4 )] 4 (BO 3 ) 9 O 21 [(OH),F] 43 (H 2 O) 1.5 , a new mineral from the moraine of the Dara-i-Pioz glacier, the Alai mountain ridge, Tien-Shan Mountains, northern Tajikistan, was solved by direct methods and refined to R 1 = 13.14% based on 3794 observed [ F o >4σ| F |] unique reflections measured with Mo- K α X-radiation on a Bruker P 4 diffractometer equipped with a CCD detector. Byzantievite is hexagonal, space group R 3, a = 9.1202(2) Å, c = 102.145(5) Å, V = 7358.0(5) Å 3 , Z = 3, D calc. = 4.151 g cm –3 . The empirical formula (electron microprobe analysis) is Ba 5.05 [(Ca 8.99 Sr 0.96 Fe 2+ 0.42 Na 0.20 ) Σ10.57 (Ce 3.46 La 1.54 Nd 1.20 Pr 0.30 Sm 0.26 Dy 0.41 Gd 0.32 Th 0.39 U 4+ 0.17 ) Σ8.05 Y 3.53 ] Σ22.15 (Ti 12.31 Nb 5.30 ) Σ17.61 (SiO 4 ) 4.65 (PO 4 ) 3.12 (BO 3 ) 8.89 O 22.16 (OH) 38.21 F 4.89 (H 2 O) 1.5 , Z = 3, calculated on the basis of 124.5 (O + F) a.p.f.u. The H 2 O and OH contents were calculated from structure refinement (F + OH = 43 a.p.f.u.; H 2 O = 1.5 a.p.f.u..), and B was determined by SIMS. The crystal structure is a framework of Ti-Ba-Ca- REE -dominant polyhedra and SiO 4 , PO 4 and BO 3 groups. In the crystal structure, there are 50 cation sites, 23 of which are fully occupied and 27 partly occupied: six of the 27 partly-occupied sites are >50% occupied, 21 <50% occupied. The crystal structure of byzantievite is an intercalation of three components, one fully ordered with 100% occupancy of cation sites, and two partly ordered with cation-site occupancies of 67% and 17% respectively. Byzantievite is the only known mineral that contains all three of the oxyanions (BO 3 ), (SiO 4 ) and (PO 4 ) as essential components.
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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 | 0.019 | 0.011 |
| Meta-epidemiology (narrow) | 0.034 | 0.030 |
| Meta-epidemiology (broad) | 0.028 | 0.016 |
| Bibliometrics | 0.010 | 0.025 |
| Science and technology studies | 0.019 | 0.029 |
| Scholarly communication | 0.015 | 0.015 |
| Open science | 0.025 | 0.022 |
| Research integrity | 0.021 | 0.035 |
| Insufficient payload (model declined to judge) | 0.001 | 0.004 |
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