Thebaite-(NH<sub>4</sub>), (NH<sub>4</sub>,K)<sub>3</sub>Al(C<sub>2</sub>O<sub>4</sub>)(PO<sub>3</sub>OH)<sub>2</sub>(H<sub>2</sub>O), a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Thebaite-(NH 4 ), (NH 4 ,K) 3 Al(C 2 O 4 )(PO 3 OH) 2 (H 2 O), is a new mineral species (IMA2020-072) from the Rowley mine, Maricopa County, Arizona, USA. It occurs in an unusual bat-guano-related, post-mining assemblage of phases that include a variety of vanadates, phosphates, oxalates and chlorides, some containing NH 4 + . Other secondary minerals found in association with thebaite-(NH 4 ) are antipinite, vanadinite and at least one other new mineral. Crystals of thebaite-(NH 4 ) are colourless blades up to ~0.1 mm in length. The streak is white, lustre is vitreous, Mohs hardness is 1½–2, tenacity is brittle and fracture is splintery. There are two good cleavages in the [010] zone, probably {100} and {10 $\bar{2}$ }. The calculated density is 2.093 g⋅cm –3 . Thebaite-(NH 4 ) is optically biaxial (–) with α = 1.490(2), β = 1.534(2), γ = 1.570(2) (white light); 2V = 82.7(5)°; slight r > v dispersion; and orientation X = b , Y ^ c = 13° in obtuse β. Electron microprobe analysis gave the empirical formula [(NH 4 ) 2.12 K 0.69 Na 0.20 ] Σ3.01 (Al 0.84 Fe 3+ 0.11 V 3+ 0.04 ) Σ0.99 (C 2 O 4 )[(P 0.98 Si 0.02 )O 3 OH] 2 (H 2 O), with the C, N and H contents constrained by the crystal structure. Raman spectroscopy confirmed the presence of NH 4 and C 2 O 4 . Thebaite-(NH 4 ) is monoclinic, P 2 1 / c , with a = 11.156(9), b = 6.234(6), c = 18.651(16) Å, β = 102.928(15)°, V = 1264.2(19) Å 3 and Z = 4. The structural unit in the crystal structure of thebaite-(NH 4 ) ( R 1 = 0.0612 for 863 I o > 2σ I reflections) is a double-strand chain of corner-sharing AlO 6 octahedra and PO 3 OH tetrahedra decorated by additional PO 3 OH tetrahedra and C 2 O 4 groups. The decorated chains connect to one another through bonds to NH 4 + and K + and through hydrogen bonds.
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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 | 0.006 | 0.005 |
| Meta-epidemiology (narrow) | 0.011 | 0.009 |
| Meta-epidemiology (broad) | 0.010 | 0.006 |
| Bibliometrics | 0.002 | 0.008 |
| Science and technology studies | 0.005 | 0.005 |
| Scholarly communication | 0.006 | 0.005 |
| Open science | 0.009 | 0.007 |
| Research integrity | 0.006 | 0.009 |
| Insufficient payload (model declined to judge) | 0.001 | 0.009 |
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