PERTLIKITE, A NEW TETRAGONAL Mg-RICH MEMBER OF THE VOLTAITE GROUP FROM MADENI ZAKH, IRAN
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
Pertlikite, a new member of the voltaite group, is the tetragonal Mg-dominant analogue of the isometric phases voltaite and zincovoltaite. At its type locality, Madeni Zakh, Iran, the mineral occurs in a pyrite-bearing trachytic eruptive rock, and probably formed after the decomposition of pyrite. Pertlikite forms single crystals up to 1 cm; the phase is associated with metavoltine, botryogen, pyrite and alunite. In contrast to voltaite and zincovoltaite, the optical properties and the single-crystal study of the structure ( R 1 = 0.022) confirm the tetragonal symmetry, ω = 1.590(2), e = 1.586(2), space group I 4 1 / acd , a 19.2080(3), c 27.2158(7) A, V 10041.2(6) A 3 , and Z = 8. The results of the chemical analysis, in combination with the Mossbauer data and the crystal-structure refinement, give the formula (K 1.98 Na 0.01 ) ∑1.99 M 2 (Fe 2+ 1.13 Mg 0.49 Mn 2+ 0.27 Fe 3+ 0.10 Zn 0.01 ) ∑2.00 M 3 (Mg 2.52 Fe 3+ 1.49 ) ∑4.01 M 1 Fe 3+ 2.00 Al 1.00 (SO 4 ) 12.00 ·18 H 2 O, which can be simplified to an ideal formula: K 2 M 2 (Fe 2+ ,Mg) 2 M 3 (Mg,Fe 3+ ) 4 M 1 Fe 3+ 2 Al (SO 4 ) 12 ·18 H 2 O. The strongest eight lines of the powder pattern [ d in A( I )( hkl )] are: 5.543(28)(132), 3.396(100)(440), 3.136(21) (345), 3.038(39)(444), 2.848(31)(361), 2.534(21)(273), 2.078(29)(567) and 1.601(21)(6104). The unit-cell parameters refined from the powder data (Cu K α radiation) are a 19.2167(2), c 27.1976(4) A. The tetragonal structure of pertlikite results from Mg,Fe order at the Fe 2 site. Relative to the isometric voltaite and zincovoltaite, the Fe 2 site splits to create a site that is predominantly Mg ( Mg 3) and another that is dominantly Fe ( Fe 2) in pertlikite. For the three metal sites, the results of the refinement are Fe 1: . Fe; Fe 2: Fe >> Mg; Mg 3: Mg >> Fe. The H 2 O molecules that bond to the Al atom are extensively disordered, as has been observed in the isometric phases. The measured density is 2.59(3) g/cm 3 (by pycnometer), and the calculated density is 2.56(1) g/cm 3 . The name honors Franz Pertlik, Professor of Mineralogy and Crystallography, University of Vienna, Austria, in recognition of his extensive work on the crystal chemistry of minerals.
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 | 0.000 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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