CERITE-(La), (La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3[SiO3(OH)]4(OH)3, A NEW MINERAL SPECIES FROM THE KHIBINA ALKALINE MASSIF: OCCURRENCE AND CRYSTAL STRUCTURE
Why this work is in the frame
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Bibliographic record
Abstract
Cerite-(La), ideally (La,Ce,Ca) 9 (Fe,Ca,Mg)(SiO 4 ) 3 [SiO 3 (OH)] 4 (OH) 3 , was found in an aegirine – natrolite – microcline vein in foyaite, Mt. Yuksporr, Khibina massif, Kola Peninsula, Russia. It forms porous pseudomorphs (up to 7 cm long) after an unidentified hexagonal prismatic mineral. Within the pseudomorphs, cerite-(La) occurs as a boxwork-like aggregates of equant to tabular crystals (flattened on c , up to 2 mm across), with dominant rhombohedral and pinacoidal faces. Associated minerals are aegirine, anatase, ancylite-(Ce), barylite, catapleiite, cerite-(Ce), chabazite-Ca, edingtonite, fluorapatite, galena, ilmenite, microcline, natrolite, sphalerite, strontianite and vanadinite. The mineral is brittle, with a conchoidal fracture. It is light yellow to pinkish brown with a white streak, and translucent with a vitreous luster. Cleavage and parting were not observed. The Mohs hardness is 5; the density is 4.7(1) g cm −3 (meas.) and 4.74 g cm −3 (calc.). It is uniaxial, optically positive, n o 1.810(5), n e 1.820(5) (for λ = 589 nm). An average result of seven electron-microprobe analyses for seven different crystals (each one reported as an average of 6–10 points from each crystal) gave La 2 O 3 37.57, Ce 2 O 3 23.67, Pr 2 O 3 0.61, Nd 2 O 3 1.48, Sm 2 O 3 0.10, Gd 2 O 3 0.24, SrO 1.97, CaO 5.09, Fe 2 O 3 1.40, MgO 0.51, SiO 2 22.38, P 2 O 5 0.63, H 2 O 3.20 (determined by the Penfield method), total 98.85, which corresponds to the empirical formula (La 4.23 Ce 2.65 Ca 1.37 Sr 0.35 Nd 0.16 Pr 0.07 Gd 0.02 Sm 0.01 ) ∑8.86 (Fe 0.32 Ca 0.30 Mg 0.23 ) ∑0.85 [SiO 4 ] 3 [(Si 0.84 P 0.16 ) ∑1.00 O 3 (OH)] 4 (OH) 2.78 , calculated on the basis of (Si + P) = 7. The mineral is trigonal, R 3 c , with a 10.7493 (6), c 38.318 (3) A, V 3834.36 A 3 , Z = 6. The strongest eight lines in the X-ray powder-diffraction pattern [ d in A( I )( hkl )] are: 3.53(26)(10.10,211), 3.47(40)(122), 3.31(38)(214), 3.10(25)(300), 2.958(100)(02.10), 2.833(37)(128), 2.689(34)(220), 1.949(34)(238,13.13). The crystal structure has been refined on the basis of F 2 for all unique reflections collected using a CCD area detector, to an R 1 of 0.036, calculated for the 1544 unique observed reflections ( F o ≥ 4σ F o ). Cerite-(La) is structurally related to cerite-(Ce). The mineral is named as the La-dominant analogue of cerite-(Ce). The structural formula for these minerals can be written as REE 9 M Ca x [SiO 4 ] 3 [SiO 3 ((OH) 1− x O x )] 3 [SiO 3 (OH)] 1− x (OH) 3 , where REE stands for La or Ce, and where M represents Fe, Mg, Ca.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 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 it