AMMONIOMAGNESIOVOLTAITE, A NEW VOLTAITE-RELATED MINERAL SPECIES FROM PECS-VASAS, HUNGARY
Bibliographic record
Abstract
Ammoniomagnesiovoltaite (IMA no. 2009-040) was found on a burning coal dump in an abandoned open coal pit at Pecs-Vasas, Mecsek Mountains, South Hungary. It is closely associated with tschermigite, sabieite, kieserite, pickeringite, and hexahydrite, but other ammonium minerals (salammoniac, mascagnite, clairite, boussingaultite, efremovite, koktaite, mohrite, ammoniojarosite, godovikovite, letovicite) as well as native sulfur, millosevichite, alunogen, metavoltine, voltaite, gypsum, anhydrite, halotrichite, butlerite, jarosite, and copiapite also occur in the surrounding area. Ammoniomagnesiovoltaite was formed by the interaction of organic matter with oxidizing iron sulfides (pyrite and marcasite). It forms crusts consisting of cubo-octahedral and octahedral crystals up to 0.05 mm in size. The mineral is translucent and pale yellow to yellowish brown in color, with white streak and vitreous luster. Its Mohs hardness is about 2–3 and the measured density is 2.55(1) g/cm 3 . Cleavage was not observed; fracture is uneven. Optically it is isotropic with n = 1.60(1). The chemical composition was found to be: SO 3 47.56, Al 2 O 3 3.31, Fe 2 O 3 12.28, FeO 5.94, MnO 1.18, MgO 7.v02, K 2 O 0.05, (NH 4 ) 2 O 3.11, and H 2 O (calc.) 17.72; total 98.17 wt.%. The empirical formula is [(NH 4 ) 2.18 K 0.02 ] ∑=2.20 (Mg 3.19 Fe 2+ 1.51 Mn 0.30 ) ∑=5.00 (Fe 3+ 2.81 Al 1.19 ) ∑=4.00 S 10.87 O 44.70 ·18H 2 O, and its simplified formula is (NH 4 ) 2 Mg 5 Fe 3+ 3 Al(SO 4 ) 12 ·18H 2 O. The strongest six lines in the X-ray powder diffraction pattern are [ d hkl in A ( I obs %, hkl )]: 5.59 (100, 422), 3.420 (72, 800), 3.562 (66, 731), 1.7836 (25, 15.3.1), 1.5582 (25, 16.6.4), and 6.85 (24, 400). According to X-ray powder diffraction, ammoniomagnesiovoltaite is structurally analogous to voltaite-group minerals; it is cubic, space group Fd 3 c , a = 27.260(2) A, V = 20257(2) A 3 , Z = 16. The new mineral is named for the dominant ammonium and magnesium in the composition and its membership in the voltaite group.
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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) | 0.001 | 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".