Fluoro-aluminoleakeite, NaNa<sub>2</sub>(Mg<sub>2</sub>Al<sub>2</sub>Li)Si<sub>8</sub>O2<sub>2</sub>F<sub>2</sub>, a new mineral of the amphibole group from Norra Kärr, Sweden: description and crystal structure
Bibliographic record
Abstract
Abstract Fluoro-aluminoleakeite, ideally , is a new mineral of the amphibole group from Norra Kärr, Sweden (IMA-CNMMNC 2009-012). It occurs in a proterozoic alkaline intrusion that mainly comprises a fine-grained schistose agpaitic nepheline-syenite (grennaite). Fluoro- aluminoleakeite occurs as isolated prismatic crystals 0.10–2 mm long in a syenitic matrix. Crystals are light greenish-blue with a greenish-blue streak. It 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 3.14 g cm–3. In plane-polarized light, it is pleochroic, X = pale green, Y = dark green, Z = pale green; X ^ a = 62.9° (in β obtuse), Y || b . Fluoro-aluminoleakeite is biaxial negative, α = 1.632(1), β = 1.638(1), γ = 1.643(1); 2V obs . = 98.0(4)°, 2V calc . = 95.5°.M Fluoro-aluminoleakeite is monoclinic, space group C 2/ m , a = 9.7043(5) Å, b = 17.7341(8) Å, c = 5.2833(3) Å, β = 104.067(4)°, V = 882.0(2) Å 3 , Z = 2. The eight strongest X-ray diffraction lines in the powder-diffraction pattern are [ d in Å, ( I ), ( hkl )]: 2.687, (100), ( 31, 151); 4.435, (80), (021, 040); 3.377, (80), (131); 2.527, (60), ( 02); 8.342, (50), (110); 3.096, (40), (310); 2.259, (40), ( 71, 12) and 2.557, (30), (002, 061). Analysis, by a combination of electron microprobe and crystal-structure refinement, gives SiO 2 58.61, Al 2 O 3 7.06, TiO 2 0.32, FeO 3.27, Fe 2 O 3 6.05, MgO 8.61, MnO 0.73, ZnO 0.43, CaO 0.05, Na 2 O 9.90, K 2 O 2.43, Li 2 O 1.62, F 3.37, H 2 O calc . 0.50, sum 101.08 wt.%. The formula unit, calculated on the basis of 24 (O,OH,F,Cl) p.f.u. with (OH) + F = 2 a.p.f.u., is A (Na 0.65 O 22 W (F 1.47 OH 0.53 )Σ= 2.00 . Crystal-structure analysis shows C Li to be completely ordered at the M (3) site, and provided reliable site populations. Fluoro-aluminoleakeite is related to the end-member leakeite, , by the substitutions C Fe3+ → C Al and W F → W (OH).
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How this classification was reachedexpand
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 | 0.002 | 0.003 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.003 | 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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".