Petersite-(Ce), Cu<sup>2+</sup><sub>6</sub>Ce(PO<sub>4</sub>)<sub>3</sub>(OH)<sub>6</sub>·3H<sub>2</sub>O, A New Mixite Group Mineral From Yavapai County, Arizona, USA
Why this work is in the frame
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Bibliographic record
Abstract
Abstract A new mineral, petersite-(Ce), ideally Cu 2+ 6 Ce(PO 4 ) 3 (OH) 6 ·3H 2 O (IMA2014-002), has been found in the Cherry Creek District of Yavapai County, Arizona, USA. It is a secondary alteration mineral associated with malachite, chlorite, a biotite phase, quartz, albite, orthoclase, hematite, chalcopyrite, and an uncharacterized hisingerite-like mineral. Petersite-(Ce) occurs as sprays of yellowish-green, acicular crystals approximately 20 × 20 × 50 μm in size. It has a white streak with vitreous luster. The mineral is brittle and has a Mohs hardness of ∼3.5; no cleavage or parting was observed. The calculated density is 3.424 g/cm 3 . An electron microprobe analysis resulted in an empirical chemical formula of Cu 6.05 (Ce 0.18 Y 0.16 La 0.12 Nd 0.09 Gd 0.03 Pr 0.02 Dy 0.01 Sm 0.01 Ca 0.42 ) Σ1.04 [(PO 4 ) 2.54 (SiO 4 ) 0.14 (PO 3 OH) 0.32 (OH) 6 ]·3.65H 2 O. Petersite-(Ce) is hexagonal, with space group P 6 3 / m and unit-cell parameters a 13.2197(18) A, c 5.8591(9) A, and V 886.8(4) A 3 , Z = 2. It is the Ce analogue of petersite-(Y) and exhibits the mixite structure type. The mixite group can be expressed by the general formula Cu 2+ 6 A ( T O 4 ) 3 (OH) 6 · 3H 2 O, where nine-coordinated A is a rare earth element, Al, Ca, Pb, or Bi, and T is P or As. The structure of petersite-(Ce) is characterized by chains of edge-sharing CuO 5 square-pyramids along c . These chains are connected in the a-b plane by edge-sharing CeO 9 polyhedra and corner-sharing PO 4 tetrahedra. Hydroxyl groups occupy each corner of the CuO 5 polyhedra not shared by a neighboring P or Ce atom. Each CeO 9 polyhedron is surrounded by three zeolitic channels. The walls of the channels, parallel to c , are six-membered, hexagonal rings composed of CuO 5 and PO 4 polyhedra in a ratio of 2:1, respectively, and contain H 2 O molecules. In our model of petersite-(Ce), we defined one distinct H 2 O site positioned to form a ring inside the channel, although there are many statistically possible locations.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.004 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.000 | 0.003 |
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