Two cubic phases in kimzeyite garnet from the type locality Magnet Cove, Arkansas
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Bibliographic record
Abstract
The crystal structure of an optically anisotropic kimzeyite garnet from Magnet Cove, Arkansas, USA, where it was first discovered, was refined with the Rietveld method, cubic space group, Ia\overline 3 d, and monochromatic [λ = 0.41422 (2) Å] synchrotron high-resolution powder X-ray diffraction (HRPXRD) data. The Rietveld refinement reduced χ 2 and overall R ( F 2 ) values are 1.840 and 0.0647, respectively. The sample, with the general garnet formula [8] X 3 [6] Y 2 [4] Z 3 [4] O 12 , contains an intergrowth of two cubic phases that occur initially as oscillatory growth zoning, and patchy intergrowths arise later from fluid-enhanced dissolution and re-precipitation. The two compositions obtained with electron-probe microanalyses (EPMA) are Ca 3.00 (Zr 1.31 Ti 4+ 0.46 Fe 3+ 0.22 Mn 3+ 0.01 ) ∑2 [Al 0.76 Fe 3+ 1.01 Si 1.23 ] ∑3 O 12 for phase 1 a and Ca 2.99 (Zr 1.48 Ti 4+ 0.37 Fe 3+ 0.15 ) ∑2 [Al 0.87 Fe 3+ 0.98 Si 1.15 ] ∑3 O 12 for phase 1 b . The weight percentage, unit-cell parameter (Å), distances (Å), and site occupancy factors (s.o.f.s) for phase 1 a are as follows: 42.6 (2)%, a = 12.46553 (3) Å, average 〈 X —O〉 = 2.482, Y —O = 2.059 (2), Z —O = 1.761 (2) Å, Ca ( X s.o.f.) = 0.960 (4), Zr ( Y s.o.f.) = 0.809 (3), and Fe ( Z s.o.f.) = 0.623 (2). The corresponding values for phase 1 b are 57.4 (2)%, a = 12.47691 (2) Å, average 〈 X —O〉 = 2.482, Y —O = 2.062 (1), Z —O = 1.762 (1) Å, Ca ( X s.o.f.) = 0.957 (3), Zr ( Y s.o.f.) = 0.828 (2) and Fe ( Z s.o.f.) = 0.617 (2). The main structural differences between the two phases are in the unit-cell parameter, Δ a = 0.01138 Å, Y (s.o.f.), and Y —O distance. Structural mismatch between the two cubic phases in a crystal gives rise to strain-induced optical anisotropy.
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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 | 0.001 | 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
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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