DISORDERED Mg-BEARING OLENITE FROM A GRANITIC PEGMATITE AT GOSLARN, AUSTRIA: A CHEMICAL, STRUCTURAL, AND INFRARED SPECTROSCOPIC STUDY
Bibliographic record
Abstract
The core and rim of a short prismatic dark brown tourmaline crystal (10 mm in diameter) from a granitic pegmatite near Goslarn, Lower Austria, were structurally and chemically characterized, including H2O determination and Mössbauer analysis. The optimized formula, calculated using chemical and structural data for the core, is X(Na0.64Ca0.11K0020.23) Y(Al1.58Mg0.91Fe2+0.41Ti0.10) Z(Al4.90Mg1.10) T(Si6.00) B3O27 [(OH)3.07O0.90F0.03], with a 15.9149(3), c 7.1757(2) Å, R = 0.014. The optimized formula for the rim is X(Na0.71Ca0.10K0010.18) Y(Al1.42Mg1.10Fe2+0.39Ti0.09) Z(Al4.94Mg1.06) T(Si5.95Al0.05) B3O27 [(OH)3.05O0.92F0.03], with a 15.9238(4), c 7.1822(2) Å, R = 0.014. Mg and Al are highly disordered in this sample of tourmaline, and the O1 site is occupied by ~[O0.9(OH)0.1]. Such samples of magnesian olenite provide a very good example of disorder driven by the short-range requirements of O2 – at the O1 site that is associated with the ~2Al + Mg configuration at the coordinating Y sites. To date, these tourmaline samples have the highest Al content at the Y site (up to ~1.6 apfu) for Mg-rich tourmaline. Three quadrupole-splitting distributions were used to represent the contributions of Y-site Fe2+ in the Mössbauer spectrum. The absence of Fe3+ reflects the low fugacity of oxygen in this pegmatite. The infrared (IR) spectrum shows four bands. These bands, at ~4528, 4457, 4358 and 4241 cm–1, are combinations of OH stretching + MOH bending motions. In the fundamental OH region, only three bands at ~3737, 3630 (sh) and 3552 cm–1 are clearly observed. The relatively sharp bands and the very low R-values of the
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".