Rinkite-(Y), Na<sub>2</sub>Ca<sub>4</sub>YTi(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>OF<sub>3</sub>, a seidozerite-supergroup TS-block mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan: Description and crystal structure
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Bibliographic record
Abstract
Abstract Rinkite-(Y), ideally Na 2 Ca 4 YTi(Si 2 O 7 ) 2 OF 3 , is a new rinkite-group (seidozerite-supergroup) TS-block mineral from the Darai-Pioz alkaline massif, Tian-Shan mountains, Tajikistan. The mineral is of hydrothermal origin. It occurs as aggregates (up to 1.5 cm long) of acicular crystals 0.1–1.0 mm thick, and as separate elongated columnar, flattened-prismatic crystals up to 1 cm long with rectangular or rhombic sections up to 0.5 mm across. Associated minerals are quartz, aegirine, microcline, neptunite, pectolite, calcite, eudialyte-group minerals, fluorite, titanite, turkestanite, kupletskite, galena, albite and pyrochlore-group minerals. Crystals are transparent and colourless to occasionally white, with a vitreous lustre. Rinkite-(Y) has a white streak, uneven, conchoidal fracture and does not fluoresce under a cathode or ultraviolet light. Cleavage is very good on {100}, no parting was observed, Mohs hardness is ~5, and it is brittle, D meas. = 3.44(2) g/cm 3 , D calc. = 3.475 g/cm 3 . It is biaxial (+) with refractive indices (λ = 590 nm) α = 1.662(2), β = 1.666(2), γ = 1.685(5); 2V meas. = 50(3) and 2V calc. = 49.7°. It is nonpleochroic. Rinkite-(Y) is monoclinic, space group P 2 1 / c , a = 7.3934(5), b = 5.6347(4), c = 18.713(1) Å, β = 101.415(2)° and V = 764.2(2) Å 3 . The six strongest reflections in the X-ray powder diffraction data [ d (Å), I , ( hkl )] are: 3.057, 100, (006, $\bar{2}$ 12, 210); 2.688, 28, (016); 9.18, 24, (002); 2.929, 17, ( $\bar{2}$ 13, 211); 3.559, 15, (104, 014) and 2.783, 14, (021). The empirical formula calculated on 18 (O + F) is Na 2.11 (Ca 3.74 Sr 0.03 Mn 0.03 ) Σ3.80 (Y 0.50 Nd 0.16 Ce 0.16 Gd 0.07 Dy 0.06 Sm 0.05 Pr 0.03 La 0.03 ${\rm U}_{0.01}^{{\rm 4 + }} {\rm )}_{\Sigma 1.07}{\rm (T}{\rm i}_{0.85}{\rm N}{\rm b}_{0.17}{\rm W}^{6+}_{0.01}{\rm T}{\rm a}_{0.01}{\rm )}_{\Sigma 1.04}\left( {{\rm S}{\rm i}_{4.03}{\rm O}_{14}} \right){\rm O}_{1.40}{\rm F}_{2.60}$ with Z = 2. The ideal formula is Na 2 Ca 4 YTi(Si 2 O 7 ) 2 OF 3 . The crystal structure was refined on a twinned crystal to R 1 = 4.59% on the basis of 1489 unique reflections ( F > 4σ F ) and is a framework of TS (Titanium-Silicate) blocks. The TS block consists of HOH sheets (H – heteropolyhedral, O – octahedral) parallel to (100). In the O sheet, the Ti-dominant [6] M O 1 site ideally gives 1 Ti apfu. The [8] M O 2 and [6] M O 3 sites are ideally occupied by Na and (NaCa) apfu. In the H sheet, the [7] M H site is occupied by Ca 1.13 Y 0.50 REE 0.37 , ( REE = rare-earth element), ideally (CaY), <M H –φ> = 2.415 Å and the [7] A P site is occupied by Ca 1.81 REE 0.19 , ideally Ca 2 , <A P –φ> = 2.458 Å. The M H + A P sites ideally give (Ca 3 Y) apfu. The M H and A P polyhedra and Si 2 O 7 groups constitute the H sheet. Linkage of H and O sheets via common vertices of M H and A P polyhedra and Si 2 O 7 groups with M O 1–3 polyhedra results in a TS block. The TS block in rinkite-(Y) exhibits linkage 1 and stereochemistry typical for the rinkite group (Ti = 1 apfu) of the seidozerite supergroup. For rinkite-(Y), the ideal structural formula of the form A P 2 M H 2 M O 4 (Si 2 O 7 ) 2 $ \left( {{\rm X}_{\rm M}^{\rm O} } \right)_2\left( {{\rm X}_{\rm A}^{\rm O} } \right)_2{\rm is }\;\left( {{\rm C}{\rm a}_3{\rm Y}} \right){\rm Na}\left( {{\rm NaCa}} \right){\rm Ti}\left( {{\rm S}{\rm i}_2{\rm O}_7} \right)_2\left( {{\rm OF}} \right){\rm F}_2 $ with Z = 2. The mineral is named rinkite-(Y) as it is structurally identical to rinkite-(Ce) and Y is the dominant rare-earth element.
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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) | 0.004 | 0.003 |
| Meta-epidemiology (broad) | 0.004 | 0.001 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.003 | 0.003 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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