GJERDINGENITE-Fe FROM NORWAY, A NEW MINERAL SPECIES IN THE LABUNTSOVITE GROUP: DESCRIPTION, CRYSTAL STRUCTURE AND TWINNING
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Bibliographic record
Abstract
Gjerdingenite-Fe occurs as yellow prisms or laths up to 1 mm long in miarolitic cavities of a sodic granite (“ekerite”) at Gjerdingselva, Lunner, Oppland, Oslo Region, Norway. The simplified formula is K 2 [(H 2 O) 2 (Fe,Mn)][(Nb,Ti) 4 (Si 4 O 12 ) 2 (OH,O) 4 ]·4H 2 O, i.e. , the mineral is an analogue of those with root name kuzmenkoite, which have Ti > Nb. The mineral is monoclinic, C 2/ m , with a 14.529(2), b 13.943(2), c 7.837(2) A, β 117.61(1)°, V 1406.8(9) A 3 , Z = 2. The crystal structure was refined to R = 0.054 on the basis of 1677 observed reflections; twinning on {001} simulates an orthorhombic F -centered lattice. The partitioning of cations and H 2 O molecules in the sites B , B ′, C (occupying channels of the zeolite-like structure) is discussed; for the refined crystal, the following crystal-chemical formula is established by comparison of chemical and structure-refinement data: {[K 1.20 Na 0.72 (H 2 O) 2.08 ] ∑4 [K 2.08 (H 2 O) 1.92 ] ∑4 }[(H 2 O) 3.40 K 0.56 Ca 0.04 ] ∑4 (Fe 0.95 Mn 0.75 □ 0.30 ) ∑2 (Nb 4.30 Ti 3.45 Fe 0.20 Zr 0.05 ) ∑8 (Si 15.90 Al 0.10 ) ∑16 O 48 [(OH) 4.16 O 3.84 ] ∑8 ·4H 2 O ( Z = 1). The strongest six reflections of the powder pattern [ d obs in A( I )( hkl )] are: 6.92(80)(020,001), 6.42(50)(200,201), 4.94(70)(021), 3.225(100)(421,400,402), 3.114(80)(041,022), and 2.512(50)(441,401,403). The mineral is optically biaxial (+) with α 1.6676(2), β 1.7001(4), γ 1.794(1); 2 V meas = 58.5(2.3)°, 2 V calc = 63.71(1)°. The Mohs hardness is about 5; D meas = 2.82(2), D calc = 2.830 g/cm 3 . The pseudo-orthorhombic crystals are flattened on {001} and elongate along [010]. Five crystal forms were observed: {100}, {010} (subordinate), {001}, {201}, and {021}.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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