ALUMINOCOQUIMBITE, AlFe(SO4)3{middle dot}9H2O, A NEW ALUMINUM IRON SULFATE FROM GROTTA DELL'ALLUME, VULCANO, AEOLIAN ISLANDS, ITALY
Bibliographic record
Abstract
Aluminocoquimbite, AlFe(SO 4 ) 3 ·9H 2 O, is a new mineral species formed as a product of low-temperature ( P 31 c (no. 163), with a 10.7065(7), c 17.3077(11) A, V 1718.2(2) A 3 and Z = 4. The strongest six reflections in the X-ray powder-diffraction pattern [ d obs in A( I )( hkl )] are: 9.251(100)(010), 5.310(83)(110), 3.152(43)(224), 4.087(33)(022), 1.765(20)(553), and 2.112(17)(251). Chemical analyses yielded the empirical formula Al 1.07 Fe 0.92 S 2.92 H 18.49 O 21 . The simplified formula is AlFe(SO 4 ) 3 ·9H 2 O. The measured density is 2.03(1) g/cm 3 , and the calculated density is 2.044 g/cm 3 . The mineral is uniaxial (+), with ω = 1.53 and e = 1.56 (589 nm). Using single-crystal diffraction data, the structure was refined to a final R(F) = 0.0218, and wR 2 = 0.0685. The structure of aluminocoquimbite is different from that of coquimbite, and contains isolated Al(H 2 O) 6 octahedral units and infinite [Fe(SO 4 ) 3 ] ∞ columns running along [001], consisting of octahedrally coordinated iron atoms and sulfate ions, similar to those observed in ferrinatrite, Na 3 (H 2 O) 3 [Fe(SO 4 ) 3 ]. Interstitial H 2 O molecules are arranged in a cyclohexane-like chair conformation held together by hydrogen bonding, as in the structure of coquimbite.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.003 | 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".