Refinement of the crystal structure of a synthetic non-stoichiometric Rb-feldspar
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Bibliographic record
Abstract
Abstract The crystal structure of hydrothermally synthesized Rb-feldspar (monoclinic, space group C 2/ m , a = 8.839(2)Å, b = 13.035(2)Å, c = 7.175(2)Å, β = 116.11(1)8, V = 742.3(3)Å 3 , Z = 4) has been refined to a final R of 0.0574 for 692 independent X-ray reflections. Microprobe analyses of the Rb-feldspar suggest deviation from stoichiometry, with excess Si and Al, resulting in a unit formula of Rb 0.811 □ 0.127 Al 1.059 Si 3.003 O 8 . Infrared (IR) spectra indicate the structural occupancy of large H 2 O content, which implies that the □Si 4 O 8 substitution favours the structural incorporation of the H 2 O molecule at the M -site. The mean T – O distances are 1.632 Å for T 1 and 1.645 Å for T 2, revealing highly disordered (Al,Si) distribution with Al/Si = 0.245/0.755 ( T 1 site) and 0.255/0.745 ( T 2 site). There are two geochemical implications from this refinement: (1) identification of both rubicline triclinic with (Al,Si) ordered distribution and synthetic monoclinic RbAlSi 3 O 8 with (Al,Si) disordered distribution implies that Rb cannot be one of factors disrupting the (Al,Si) ordered and disordered distributions in feldspars; and (2) natural and synthetic feldspars capable of accommodating the large cations tend to incorporate □Si 4 O 8 , excess Al and H 2 O components in their crystal structures.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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