FLUOROPARGASITE, A NEW MEMBER OF THE CALCIC AMPHIBOLES FROM EDENVILLE, ORANGE COUNTY, NEW YORK
Bibliographic record
Abstract
Fluoropargasite (IMA 2003-050), ideally NaCa2(Mg4 Al)(Si6Al2)O22F2, is a new member of the calcic amphiboles (group 2). It was collected from the Franklin Marble, of Grenville age, at Edenville, Orange County, New York, the type locality. The holotype specimen is a 13 × 7 × 4.5 cm crystal associated with calcite, actinolite, titanite and phlogopite. The same mineral has also been identified from Russell, St. Lawrence County, and Monroe, Orange County, New York. The mineral is black, with a gray to greenish gray streak and a vitreous luster. It is transparent to translucent in very thin fragments, non-fluorescent in ultraviolet light, brittle with a conchoidal fracture, and has a perfect {110} cleavage, a Mohs hardness of ∼6, a Dmeas of 3.18 g/cm3 and a Dcalc of 3.19 g/cm3 for the empirical formula with Z = 2. Fluoropargasite is biaxial (+), with α 1.634, β 1.642, γ 1.654 (all ± 0.002), 2Vmeas 68°, 2Vcalc 79°, Y = b and Z Λ c = 24° (acute), dispersion r > v, weak, pleochroism X colorless to light brown, Y light brown, and Z brown. The Gladstone-Dale compatibility index is superior, with 1 - (KP/KC) = -0.010 for the calculated density, and -0.016 for the measured density. The mineral is monoclinic, C2/m, with refined unit-cell parameters a 9.8771(6), b 18.041(1), c 5.3092(3) Å, β 105.133(1)°, V 913.25(3) Å3, Z = 2, and a:b:c 0.5475:1:0.2943, determined from single-crystal X-ray-diffraction data using MoKα radiation. A refinement of the structure led to the determination of cation site-preferences and degree of order. The six strongest lines in the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 8.44(100)(110), 3.13(80)(310), 3.28(41)(240), 2.345(41)(351), 2.810(32)(330), and 2.385(21)(350). The chemical composition determined by electron-microprobe analysis is SiO2 43.30, MgO 14.44, FeO 9.73, CaO 12.29, Al2O3 12.11, Na2O 2.88, TiO2 0.90, MnO 0.08, K2O 0.91, V2O3 0.18, Cr2O3 0.01, F 2.71, Cl 0.12, O = (F + Cl)-1.17, H2O (stoichiometry) 0.71, sum 99.20 wt%, which corresponds to the empirical formula: (Na0.75 K0.17)∑0.92 (Ca1.94 Na0.06)∑2.00 (Mg3.18 Fe2+1.18Al0.50Ti0.10 Fe3+0.02V0.02Mn0.01) ∑5.00(Si6.39Al1.61) ∑8.00O22[F1.26(OH)0.71 Cl0.03]∑2.00, with (OH + F + CI) = 2 apfu based on 24 anions. The name of the mineral is in accord with the IMA nomenclature for amphiboles.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
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".