Fluoroleakeite, NaNa<sub>2</sub>(Mg<sub>2</sub>Fe<sup>3+</sup><sub>2</sub>Li)Si<sub>8</sub>O<sub>22</sub>F<sub>2</sub>, a new mineral of the amphibole group from the Verkhnee Espe deposit, Akjailyautas Mountains, Eastern Kazakhstan District, Kazakhstan: description and crystal structure
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Bibliographic record
Abstract
Abstract Fluoroleakeite, NaNa 2 (Mg 2 Fe 3+ 2 Li)Si 8 O 22 F 2 is a new mineral of the amphibole group from the Verkhnee Espe deposit, Akjailyautas mountains, eastern Kazakhstan district, Kazakhstan. The granites and their host rocks have been intensely reworked by post-magmatic and host-rock fluids, resulting in intense recrystallization, enrichment in F, Li and rare elements, and replacement of primary biotite and sodic-calcic amphiboles by Li-bearing riebeckite, aegirine, astrophyllite and other sodic minerals including fluoroleakeite. Crystals are prismatic parallel to [001] with {100} and {110} faces and cleavage surfaces, and the prism direction is terminated by irregular fractures. Grains are up to 3 mm long, and occur as isolated crystals, as small aggregates, and as inclusions in cámaraite. Crystals are black with a very pale grey to colourless streak. Fluoroleakeite is brittle, has a Mohs hardness of 6 and a splintery fracture; it is non-fluorescent with perfect {110} cleavage, no observable parting, and has a calculated density of 3.245 g cm –3 . In plane-polarized light, it is pleochroic, X = pale grey-green, Y = medium grey, Z = grey-brown; X ^ a = 14.1° (in β obtuse), Y ‖ b , Z ^ c = 75.9° (in β acute). Fluoroleakeite is biaxial negative, α = 1.663(2), β = 1.673(2), γ = 1.680(2); 2V obs = 80.9(6)°, 2V calc = 79.4° Fluoro-leakeite is monoclinic, space group C 2/ m , a = 9.8927(3), b = 17.9257(6), c = 5.2969(2) Å, β = 103.990(1)°, V = 905.7(1) Å 3 , Z = 2. The strongest ten X-ray diffraction lines in the powder pattern are [ d in Å( I )( hkl )]: 2.718(100)(151), 8.434(40)(110), 4.464(30)(021), 3.405(30)(131), 3.137(20)(310), 2.541(20)( ), 2.166(20)(261), 2.325(15)( ), 2.275(15)( ) and 2.806(10)(330). Analysis by a combination of electron microprobe and crystal-structure refinement gives SiO 2 53.34, Al 2 O 3 0.62, TiO 2 1.27, V 2 O 3 0.05, Fe 2 O 3 15.10, FeO 6.00, MnO 2.04, ZnO 0.18, MgO 6.40, CaO 0.13, Na 2 O 9.08, K 2 O 1.98, Li 2 O 1.10, F 3.33, H 2 O calc 0.16, sum 99.39 wt.%. The formula unit, calculated on the basis of 23 O, is A (Na 0.64 K 0.38 )(Na 1.98 Ca 0.02 )(Li 0.66 Mg 1.42 Fe 0.75 2+ Mn 0.26 2+ Zn 0.02 Fe 1.69 3+ V 0.01 3+ Ti 0.14 4+ Al 0.03 ) (Si 7.93 Al 0.07 )O 22 (F 1.57 OH 0.16 O 0.27 ). Crystal-structure refinement shows Li to be completely ordered at the M (3) site. Fluoroleakeite, ideally NaNa 2 (Mg 2 Fe 2 3+ Li)Si 8 O 22 F 2 , is related to end-member leakeite, NaNa 2 (Mg 2 Fe 2 3+ Li)Si 8 O 22 (OH) 2 by the substitution F → (OH).
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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 | 0.002 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.003 | 0.004 |
| Insufficient payload (model declined to judge) | 0.000 | 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