CRYSTAL STRUCTURE AND MOSSBAUER SPECTROSCOPY OF TSCHERMAKITE FROM THE RUBY LOCALITY AT FISKENAESSET, GREENLAND
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Bibliographic record
Abstract
The crystal structure of tschermakite from Fiskenaesset, Greenland, (K 0.05 Na 0.38 ) ∑0.43 (Ca 1.80 Na 0.05 Fe 2+ 0.15 ) ∑2.00 (Mg 3.65 Fe 2+ 0.18 Mn 0.03 Fe 3+ 0.09 Al 0.81 Cr 0.19 Ti 0.05 ) ∑5.00 (Si 6.43 Al 1.57 ) ∑8.00 O 22 [(OH) 1.95 F 0.04 Cl 0.01 ] ∑2.00 , a 9.8059(5), b 17.9721(8), c 5.3012(2) A, β 105.063(1)°, V 902.15 A 3 , space group C 2/ m , Z = 2, has been refined to an R 1 index of 3.2% using Mo K α single-crystal X-ray diffraction. The ratio Fe 3+ /Fe tot was determined by Mossbauer spectroscopy. The unit formula (calculated from the results of electron-microprobe analysis), the refined site-scattering values, observed average bond-lengths, and Mossbauer spectroscopy were used to assign site populations. Tetrahedrally coordinated Al occurs at both the T (1) and T (2) sites, but is strongly ordered at T (1), and [6] Al occurs at both the M (2) and M (3) sites, but is strongly ordered at M (2). Magnesium shows the site preference M (1) = M (2) > M (3), and higher-valence transition metals (Ti, Fe 3+ and Cr 3+ ) are ordered at M (2). The formula calculated from the electron-microprobe analysis showed an excess of C -group cations of 0.15 apfu , exactly in accord with the amount of Fe 2+ at M (4) indicated by Mossbauer spectroscopy. At the A site, Na was split between the A (2) and A ( m ) sites, and K was assigned to the A ( m ) site. We derived the short-range arrangements involving the M (4), O(3) and A sites, and calculated their relative fractions. As with other complicated monoclinic amphiboles, short-range order is common and dictated by the valence-sum rule of localized bond-valence theory.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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.
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