Mendeleevite-(Nd), (Cs,□)<sub>6</sub> (□,Cs)<sub>6</sub> (□,K)<sub>6</sub> (<i>REE</i>,Ca)<sub>30</sub>(Si<sub>70</sub>O<sub>175</sub>)(OH,H<sub>2</sub>O,F)<sub>35</sub>, a new mineral from the Darai-Pioz alkaline massif, Tajikistan
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Bibliographic record
Abstract
Abstract Mendeleevite-(Nd), (Cs,□) 6 (□,Cs) 6 (□,K) 6 ( REE ,Ca) 30 (Si 70 O 175 )(OH,H 2 O,F) 35 is a new mineral from the Darai-Pioz alkaline massif, Tajikistan. Mendeleevite-(Nd) was found in a pectolite aggregate in silexites (quartz-rich rocks) which consist of fine to medium pectolite grains, quartz, aegirine and fluorite, with minor khvorovite, mendeleevite-(Ce), sokolovaite, hyalotekite, orlovite, kirchhoffite, pekovite, neptunite, zeravshanite, senkevichite, nordite-(Nd), alamosite, pyrochlore-group minerals and baratovite. Mendeleevite-(Nd) forms colourless cubic crystals 10–40 μm in size; it has a vitreous lustre and a Mohs hardness of 5–5.5; D meas . = 3.20(2) g/cm 3 , D calc. = 3.155 g/cm 3 . Mendeleevite-(Nd) is optically isotropic, with the refractive index n = 1.582(2). Mendeleevite-(Nd) is cubic, space group Pm 3̄, a = 21.9106(4) Å; Z = 2. The six strongest reflections in the powder X-ray diffraction pattern are [ d (Å), I (%), ( h k l )] are: 11.01, 100, (0 0 2); 15.63, 55, (0 1 1); 3.47, 42, (2 0 6); 3.099, 42, (3 4 5); 2.192, 42, (0 0 10); 1.819, 41, (3 6 10). Chemical analysis by electron microprobe gave SiO 2 42.30, Ce 2 O 3 10.12, La 2 O 3 3.60, Nd 2 O 3 16.19, Pr 2 O 3 2.79, Sm 2 O 3 4.19, Gd 2 O 3 1.69, Eu 2 O 3 0.47, SrO 2.99, CaO 2.20, Cs 2 O 8.50, K 2 O 0.85, H 2 O 3.85, F 1.25, –O = F 2 –0.53, sum 100.46 wt.%, with H 2 O calculated by analogy with mendeleevite-(Ce). The empirical formula based on 210 (O + F) apfu, with F + OH + H 2 O = 35 pfu, is Cs 6 (□ 4.20 K 1.80 ) ∑6 {[(Nd 9.57 Ce 6.13 Sm 2.39 La 2.20 Pr 1.68 Gd 0.93 Eu 0.27 ) ∑23.17 (Ca 3.90 Sr 2.87 ) ∑6.77 ] ∑29.94 □ 0.06 } ∑30 (Si 70.03 O 175 )(OH 14.47 F 6.54 ) ∑21.01 (H 2 O) 14 , Z = 2. The simplified and ideal formulae are (Cs,□) 6 (□,Cs) 6 (□,K) 6 ( REE ,Ca) 30 (Si 70 O 175 )(OH, H 2 O,F) 35 and Cs 6 ( REE 23 Ca 7 )(Si 70 O 175 )(OH,F) 19 (H 2 O) 16 , respectively. The compatibility index (from measured density) = – 0.039 (excellent). Mendeleevite-(Nd) is a Nd analogue of mendeleevite-(Ce), (Cs,□) 6 (□,Cs) 6 (□,K) 6 ( REE ,Ca,□) 30 (Si 70 O 175 )(H 2 O,OH,F,□) 35 . Both minerals are named after Dmitri Mendeleev (1834–1907), the great Russian chemist, author of the periodic table of chemical elements, who has had a significant impact on the development of natural sciences and industry, both in Russia and around the world.
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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 | 0.004 |
| Meta-epidemiology (narrow) | 0.011 | 0.009 |
| Meta-epidemiology (broad) | 0.010 | 0.005 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.007 | 0.007 |
| Scholarly communication | 0.008 | 0.006 |
| Open science | 0.012 | 0.008 |
| Research integrity | 0.006 | 0.008 |
| Insufficient payload (model declined to judge) | 0.001 | 0.008 |
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