BEUSITE AND AN UNUSUAL Mn-RICH APATITE FROM THE SZKLARY GRANITIC PEGMATITE, LOWER SILESIA, SOUTHWESTERN POLAND
Bibliographic record
Abstract
An assemblage of phosphate minerals, including beusite, Mn-rich fluorapatite, chlorapatite, hydroxylapatite and traces of alluaudite and mitridatite, usually accompanied by Mn-rich oxides also enriched in Ba, Ca, Mg and Ni, and Bi and Pb, has been recognized in a granitic pegmatite occurring within serpentinites of the Szklary massif in Lower Silesia, Poland. This pegmatite is a representative of the MSREL–REE subclass of the muscovite – rare-element pegmatites. The beusite usually occurs there as a Mn-dominant, (Ca,Fe)-bearing, Mg-enriched phase devoid of the typical lamellar intergrowths with triphylite or sarcopside, evolving toward more and more Mn-enriched varieties, stabilized by the earlier crystallization of tourmaline and fluorapatite. In terms of enrichment in Mn, the beusite from Szklary is on a level with that from the Cross Lake pegmatite in Canada, considered as the example richest in Mn worldwide. Similarly, Mn-rich fluorapatite containing up to 19.3 wt.% MnO, and a Mn-dominant apatite-group mineral containing up to 31.5 wt.% MnO, are two apatite species richest in Mn worldwide, the second close to the ideal Mn 3 Ca 2 (PO 4 ) 3 (Cl,F,OH) composition. The progressive removal of Fe over Mn, a decrease in the activities of F and Fe due to crystallization of abundant Fe-bearing tourmaline and fluorapatite, extraction of Mn from pegmatite-forming, H 2 O-undersaturated, Cl-enriched melts by an exsolved H 2 O-, F- and Cl-bearing volatile phase, and metasomatic alteration induced by residual Mn- and Cl-bearing fluids additionally enriched in Mn released during the dissolution of metastable beusite are the main reasons of such a high degree of Mn enrichment in the phosphates from the Szklary pegmatite.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 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".