Manganoarrojadite-(KNa), KNa<sub>5</sub>MnFe<sub>13</sub>Al(PO<sub>4</sub>)<sub>11</sub>(PO<sub>3</sub>OH)(OH)<sub>2</sub>, a new arrojadite-group mineral from the Palermo No. 1 mine, New Hampshire, USA
Bibliographic record
Abstract
Abstract A new arrojadite-group mineral manganoarrojadite-(KNa), ideally KNa 5 MnFe 13 Al(PO 4 ) 11 (PO 3 OH)(OH) 2 , was found in a phosphate-bearing granite pegmatite at the Palermo No. 1 mine, New Hampshire, USA. It forms anhedral grains up to 1 × 1.5 cm in size combined in aggregates with vivianite, goyazite, quartz and calcite. The mineral is olive green with a pale green streak and vitreous to greasy lustre. The cleavage is good in one direction. The Mohs hardness is 4½. D calc is 3.53 g/cm 3 . Manganoarrojadite-(KNa) is optically biaxial (–), α = 1.658(2), β = 1.666(2), γ = 1.670(2), 2V meas. = 67(1)° and 2V calc. = 70° (589 nm). The infrared spectrum is reported. The composition (wt.%) is Na 2 O 6.97, K 2 O 1.78, CaO 0.31, MgO 2.17, MnO 12.30, FeO 31.17, Al 2 O 3 2.43, P 2 O 5 40.48, F 0.30, H 2 O 1.32, O = F 2 –0.13, total 99.10. The empirical formula calculated on the basis of 12 P and (O+OH+F) = 50 apfu is Na 4.73 K 0.80 Ca 0.12 Mg 1.13 Mn 2+ 3.65 Fe 2+ 9.13 Al 1.00 P 12.00 O 46.59 OH 3.08 F 0.33 . The ideal structural formula is A 1 K A 2 Na B 1 Na B 2 Na Na1,2 Na 2 Na3 □ C Mn M Fe 13 Al(PO 4 ) 11 (PO 3 OH) W (OH) 2 . The mineral is monoclinic, Cc , a = 16.5345(3), b = 10.0406(2), c = 24.6261(5) Å, β = 105.891(2)°, V = 3932.09(14) Å 3 and Z = 4. The strongest reflections of the powder X-ray diffraction pattern [ d ,Å( I )( hkl )] are: 5.902(24)(202), 5.025(24)(020), 3.208(47)(206, $\;\bar{1}$ 32), 3.048(100)( $\bar{5}$ 14, $\bar{4}$ 24), 2.758(24)( $\bar{6}$ 02) and 2.704(70)(226). The crystal structure, refined from single-crystal X-ray diffraction data ( R 1 = 0.025), is of the arrojadite structure type. Manganoarrojadite-(KNa) is the first arrojadite-group mineral with Mn dominant on the site usually occupied by Ca and without Ca as the dominant cation at any cation site.
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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 | 0.000 | 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) | 0.004 | 0.001 |
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".