Lobanovite, K<sub>2</sub>Na(Fe<sub>4</sub><sup>2+</sup>Mg<sub>2</sub>Na)Ti<sub>2</sub>(Si<sub>4</sub>O<sub>12</sub>)<sub>2</sub>O<sub>2</sub>(OH)<sub>4</sub>, a new mineral of the astrophyllite supergroup and its relation to magnesioastrophyllite
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Bibliographic record
Abstract
Abstract Lobanovite, K 2 Na(Fe 4 2+ Mg 2 Na)Ti 2 (Si 4 O 12 ) 2 O 2 (OH) 4 , is a new mineral of the astrophyllite supergroup from Mt. Yukspor, the Khibiny alkaline massif, Kola Peninsula Russia. It has been known previously under the following names: monoclinic astrophyllite, magnesium astrophyllite, magnesiumastrophyllite and magnesioastrophyllite but has never been formally proposed and approved as a valid mineral species by the Commission on new Minerals, Nomenclature and Classification of the International Mineralogical Association. It has now been revalidated and named lobanovite after Dr. Konstantin V. Lobanov, a prominent Russian ore geologist who worked in the Kola Peninsula for more than forty years (Nomenclature voting proposal 15-B). Lobanovite has been described from pegmatitic cavities on Mt. Yukspor where it occurs as elongated bladed crystals, up to 0.04 mm wide and 0.2 mm long, with a straw yellow to orange colour. Associated minerals are shcherbakovite, lamprophyllite, delindeite, wadeite, umbite and kostylevite. Lobanovite is biaxial (–) with refractive indices (λ = 589 nm) α = 1.658, β calc . = 1.687, γ = 1.710; 2V meas. = 81.5– 83°. Lobanovite is monoclinic, space group C 2/ m , a = 5.3327(2), b = 23.1535(9), c = 10.3775(4) Å, β = 99.615(1)°, V = 1263.3 (1) Å 3 , Z = 2. The six strongest reflections in the powder X-ray diffraction data [ d (Å), I, ( hkl )] are: 3.38, 100, (003); 2.548, 90, (063); 10.1, 80, (001); 3.80, 60, (042,131); 3.079, 50, (132,062); 2.763, 90, (1̄71). The chemical composition of lobanovite was determined by electron-microprobe analysis and the empirical formula (K 1.97 Ba 0.01 ) ∑1.98 (Na 0.65 Ca 0.14 ) ∑0.79 (Fe 3.18 2+ Mg 2.02 Na 1.00 Mn 0.72 ) ∑6.92 (Ti 1.99 Nb 0.06 ) ∑2.05 [(Si 8.01 Al 0.06 ) ∑8.07 O 24 ]O 2 (OH) 4.03 F 0.19 was calculated on the basis of 30.2 (O + OH + F) anions, with H 2 O calculated from structure refinement, D calc. = 3.161 g cm –3 . In the structure of lobanovite, the main structural unit is the HOH block, which consists of one close-packed O (Octahedral) and two H (Heteropolyhedral) sheets. The M(1–4) octahedra form the O sheet and the T 4 O 12 astrophyllite ribbons and [5]-coordinated Ti-dominant D polyhedra link through common vertices to form the H sheet. The HOH blocks repeat along [001], and K and Na atoms occur at the interstitial A and B sites. The simplified and end-member formulae of lobanovite are K 2 Na [(Fe 2+ ,Mn) 4 Mg 2 Na]Ti 2 (Si 4 O 12 ) 2 O 2 (OH) 4 and K 2 Na(Fe 4 2+ Mg 2 Na)Ti 2 (Si 4 O 12 ) 2 O 2 (OH) 4 , respectively.
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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 | 0.005 |
| Bibliometrics | 0.003 | 0.006 |
| Science and technology studies | 0.006 | 0.006 |
| Scholarly communication | 0.006 | 0.007 |
| Open science | 0.009 | 0.008 |
| Research integrity | 0.006 | 0.008 |
| Insufficient payload (model declined to judge) | 0.000 | 0.004 |
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