PETERSENITE-(Ce), A NEW MINERAL FROM MONT SAINT.HILAIRE, AND ITS STRUCTURAL RELATIONSHIP TO OTHER REE CARBONATES
Bibliographic record
Abstract
Petersenite-(Ce) is a newly discovered rare-earth-element carbonate from the Poudrette Quarry, Mont Saint-Hilaire, Quebec. It is grey, with a slight pink tint, forming striated prisms up to 7 mm in length, It has a vitreous luster and is translucent o transpaxent. Pete$enite-(Ce) is relatively soft (Mohs hardness-3) and very brittle, having a conchoidal fracture. Optical properties are biaxial, with moderate dispersion, no absorption, and indices of refraction a 1.623(1), B 1.636(1), y 1.649(l),2V**. = 89.7(5) ' and2V"6". = 89.8o, and an optical orientation of X = b,Y lt c = 30o and Z = a.Electron' microprobeanalysesgaveNa2O 17.38,CaO 1.32,BaO 0.32,SrO 1.70,La2O3 14.49,CqO323.66,Pt2O3 2.00,Nd2O35.82, Sm2O3 0.60 and CO2 (from crystal-structure analysis) 32.92, total 100.21 wt.Vo, which yields the empirical formula O{4.riCuo.rrtcto.qel4ssN4.z:Sro.rrPro.orSmo.rBto.or)(CO:): or, idea[y, Naa(REE12(CO) sfor Z = 4, with D",1. = 3.67 Elcm3 and Dr*. =3.69 glcm3, Crystal-structure analysis shows the mineral to be monoclinic, space group?r, with a20.872(4), b_6.367(l), c 10.601_(2) A and B120.50(3f. The sffongest 1ines iltle X-ray powder pattern [d in A(O(&&DI are 9.13(3)(201,001), s.e6)Orr,ur,2or,40D,4.l3(3X501,301),3.70(q(412,012),2.607(10)(402,802,420),2.148(3X814,014) aad l.92l])(432,032,430). The crystal structure has the subcell of burbankite and remondite-(Ce), but the supercell changes the ratio of [8]-coordinated to [10]-coordinated cations. The layered structure is compared to that of other REE carbonates.
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How this classification was reachedexpand
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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.001 | 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 teacher head, 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".