Barrydawsonite-(Y), Na<sub>1.5</sub>CaY<sub>0.5</sub>Si<sub>3</sub>O<sub>9</sub>H: a new pyroxenoid of the pectolite–serandite group
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Abstract The new pyroxenoid barrydawsonite-(Y) occurs at the Merlot Claim, North Red Wine Pluton, Labrador, Canada (62°32'38.54'' W; 54°08'1.37'' N). The host rock is a metamorphosed eudialyte syenite consisting of eudialyte, potassic arfvedsonite, jadeitic aegirine, nepheline, albite and potassium feldspar with accessory Y-bearing pectolite, britholite and steenstrupine. Barrydawsonite-(Y) crystals commonly have discrete thin rims of Y-bearing pectolite. The average empirical formula (based on nine anions p.f.u.) is Na 1.54 Ca 0.74 Mn 0.15 Fe 0.07 Y 0.38 Nd 0.01 Sm 0.01 Gd 0.02 Tb 0.01 Dy 0.04 Ho 0.01 Er 0.02 Yb 0.01 Si 3.00 O 9 H. The simplified formula is Na 1.5 Y 0.5 CaSi 3 O 9 H. Barrydawsonite-(Y) is related to pectolite by the substitution ½[Na M 3+ Ca –2 ] ( M 3+ = Y, REE ), and is exceptional in being the only member of the pectolite group that has the structure of the monoclinic M2abc polytype. The crystal structure has been determined in monoclinic space group P 2 1 / a: a = 15.5026(2), b = 7.0233(1), c = 6.9769(1) Å, β = 95.149(1)°, V = 756.58(2) Å 3 ( Z = 4). Final agreement indices are R 1 = 0.038, wR 2 = 0.068, Goof = 1.136. The asymmetric unit of barrydawsonite-(Y) has three metal sites: M (1) = Ca, M (2) = Na0.5(Y,REE)0.5, M (3) = Na. M (1) and M (2) are octahedrally-coordinated sites, whereas M (3) is [8]-coordinated as in pectolite and serandite. The structural formula for the empirical composition is M (3) Na 1.00 M (2) (Na 0.50 Y 0.38 REE 0.13 ) Σ=1.01 M (1) (Na 0.04 Ca 0.74 Mn 0.15 2+ Fe 0.07 2+ ) Σ=1.00 Si 3 O 9 H. There is excellent agreement between the refined site-scattering values and those calculated based upon the structural formula. Barrydawsonite-(Y) is biaxial (+) with α = 1.612(1), β = 1.617(1), γ = 1.630(1) (white light) and 2V = 63(1)°. The five strongest peaks in the X-ray powder diffraction pattern are [ d obs (Å), I obs %, (hkl)]: [2.905, 100, (023)], [3.094, 30, (210,211,121,202)], [1.7613, 29, (127,323,040)], [3.272, 27, (202,104)], [1.7016, 27, (140,227,325)].
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| 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