HydropascoitE, Ca<sub>3</sub>(V<sub>10</sub>O<sub>28</sub>)·24H<sub>2</sub>O, A New Decavanadate Mineral From the Packrat Mine, Mesa County, Colorado
Bibliographic record
Abstract
Abstract Hydropascoite, Ca 3 (V 10 O 28 )·24H 2 O, is a new mineral species (IMA2016-032) discovered in the Packrat mine, near Gateway, Mesa County, Colorado. It occurs as blades up to 2 mm in length on asphaltum associated with montroseite- and corvusite-bearing sandstone. Hydropascoite is dark yellow green, with a pistachio green streak, vitreous luster, Mohs hardness of ca . 1½, brittle tenacity, irregular fracture, and one perfect cleavage on {001}. Density (meas.) is 2.38(2) g/cm 3 . Hydropascoite is biaxial (–), with α 1.730(5), β 1.780(5), γ 1.790(5) (white light); 2 V (meas.) = 54.1(6)°, and extreme dispersion. The optical orientation is X ^ a ≈ 10°, Z ^ c* ≈ 20°. Hydropascoite is pleochroic, with X = bluish green, Y = orange, Z = yellowish green; X > Z > Y . Electron probe microanalysis gave the empirical formula (Ca 2.69 Na 0.30 ) Σ2.99 (H 0.31 V 5+ 10 O 28 )·24H 2 O, based on O = 52. Hydropascoite is triclinic, , a 10.08700(19), b 11.0708(2), c 21.8112(15) A, α 94.112(7)°, β 96.053(7)°, γ 116.398(8)°, V 2150.2(2) A 3 , and Z = 2. The strongest four lines in the diffraction pattern are [ d in A( I )( hkl )]: 8.92(100)(), 10.70(31)(002), 9.77(28)(010), and 7.4539(22)(). The atomic arrangement of hydropascoite was solved and refined to R 1 = 0.0488 for 8187 independent reflections with F > 4σ F . The structural unit in hydropascoite is the [V 10 O 28 ] 6– decavanadate group; charge balance in the structure is maintained by the [Ca 3 ·24H 2 O] 6+ interstitial complex. The three Ca polyhedra in the interstitial complex are not polymerized. Linkage between the structural unit and the components of the interstitial complex is principally by hydrogen bonding. In addition to the extensive hydrogen bonding, three oxygen atoms of the structural unit bond directly to calcium atoms of the interstitial complex. The mineral is named to recognize its chemical and structural similarity to pascoite, Ca 3 (V 10 O 28 )·17H 2 O, and its higher H 2 O content.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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; 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".