ALUMINOCOQUIMBITE, AlFe(SO4)3{middle dot}9H2O, A NEW ALUMINUM IRON SULFATE FROM GROTTA DELL'ALLUME, VULCANO, AEOLIAN ISLANDS, ITALY
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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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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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 it