MARTYITE, A NEW MINERAL SPECIES RELATED TO VOLBORTHITE: DESCRIPTION AND CRYSTAL STRUCTURE
Bibliographic record
Abstract
Martyite, Zn 3 (V 2 O 7 )(OH) 2 ·2H 2 O, a new mineral species from the Blue Cap mine, near La Sal, San Juan County, Utah, U.S.A., is named for its discoverer, Joe Marty, of Salt Lake City, Utah, who is also responsible for the discovery of three other new minerals from the same area. Martyite formed from post-mining leaching and oxidation of V–U oxide replacements of organic matter. It occurs as thin yellow-orange to red-orange plates and flakes with a rounded or irregular outline, up to 0.01 mm thick and 1 mm long, typically in irregularly intergrown mats and rosette-like clusters. The mineral has a pale yellow-orange streak, an adamantine luster, a Mohs hardness of about 3, and two cleavages, {001} perfect and {110} good. The measured density is 3.37(3) g/cm 3 , and the calculated density is 3.375 g/cm 3 . It is optically uniaxial (+), ω 1.797(3), e 1.806(3), and distinctly pleochroic: O >> E. Electron-microprobe analyses provided: ZnO 46.93, CoO 2.39, CaO 0.58, MgO 0.03, V 2 O 5 39.47, H 2 O 12.06 (calc.), total 101.46% which, based on V = 2 apfu and sufficient H for charge balance, yields (Zn 2.66 Co 0.15 Ca 0.05 )(V 2 O 7 )(OH) 1.72 ·2.23H 2 O. Martyite is hexagonal, P 3 m 1, a 6.0818(4), c 7.1793(10) A, V 229.97(4) A 3 , Z = 1. Its atomic structure [ R 1 = 1.84% for F o > 4σ( F o )] consists of edge-sharing sheets of Zn–O octahedra parallel to (001) linked in the c direction by divanadate (V 2 O 7 ) groups. The open space in the resulting framework is occupied by H 2 O molecules. The structure of martyite is topologically identical to that of volborthite, Cu 3 (V 2 O 7 )(OH) 2 ·2H 2 O. The Jahn–Teller distortion of one of the two non-equivalent Cu–O octahedra in volborthite results in a monoclinic symmetry. These minerals may have applications as molecular sieve materials.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| 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".