Fluoro-sodic-ferropedrizite, NaLi<sub>2</sub>(Fe<sub>2</sub><sup>2+</sup>Al<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 Sutlug River, Tuva Republic, Russia: description and crystal structure
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Bibliographic record
Abstract
Abstract Fluoro-sodic-ferropedrizite, ideally A Na B Li 2 C ( ) T Si 8 O 22 W F2, is a new mineral of the amphibole group from the Sutlug River, Tuva Republic, Russia. It occurs at the endogenic contact of a Li-pegmatite with country rocks near to a diabase dyke and formed by reaction of the pegmatitic melt with the country rock. Fluoro-sodic-ferropedrizite occurs as prismatic to acicular crystals, ranging in length from 0.1–3 cm and widths of up to 50 μm. Crystals occur inparallel to sub-parallel aggregates up to 5 mm across ina matrix of calcite and plagioclase feldspar. Crystals are pale bluish-grey with a greyish-white streak. Fluoro-sodic-ferropedrizite 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 3.116 g cm –3 . In plane-polarized light, it is pleochroic, X = pale purple-grey, Y = light grey, Z = colourless; X ^ a = 71.2º (in β acute), Y || b , Z ^ c = 83.4º (in β obtuse). Fluoro-sodic-ferropedrizite is biaxial positive, α = 1.642(1), β = 1.644(1), γ = 1.652(1); 2V (obs) = 68.0(3)º, 2V (calc) = 56.4º. Fluoro-sodic-ferropedrizite is monoclinic, space group C 2/ m, a = 9.3720(4) Å, b = 17.6312(8) Å, c = 5.2732(3) Å, β = 102.247(4)º, V = 851.5(2) Å 3 , Z = 2. The strongest ten X-ray diffraction lines in the powder patternare ( d in Å ,( I ),( hkl )): 8.146,(10),(110); 2.686,(9),(151); 3.008,(8),(310); 4.430,(7),(021); 2.485,(6),( 02); 3.383,(4),(131); 2.876,(3),( 51, 11); 2.199,(3),( 12); 4.030,(2),(111) and 3.795,(2),( 31). Analysis by a combination of electron microprobe and crystal-structure refinement gives SiO 2 59.81, Al 2 O 3 12.66, TiO 2 0.09, FeO 10.32, MgO 5.56, MnO 0.73, ZnO 0.17, CaO 0.20, Na 2 O 2.81, Li 2 O 4.80, F 2.43, H 2 O calc 1.10, sum = 99.65 wt.%. The formula unit, calculated on the basis of 24(O,OH,F) is A (Na 0.68 ) B (Li 1.92 Na 0.05 Ca 0.03 ) C ( ) T (Si 7.98 Al 0.02 )O 22 W (F 1.03 OH 0.97 ). Crystal-structure refinement shows Li to be completely ordered at the M(3) and M(4) sites. Fluoro-sodic-ferropedrizite, ideally A Na B Li 2 C ( ) T Si 8 O 22 W F2, is related to the theoretical end-member ‘sodic-pedrizite’, A Na B Li 2 C (Mg 2 Al 2 Li) T Si 8 O 22 W (OH) 2 , by the substitutions C Fe 2+ → C Mg and W F → W (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 | 0.002 |
| 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 | 0.002 | 0.003 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.002 | 0.003 |
| 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