STEROPESITE, Tl3BiCl6, A NEW THALLIUM BISMUTH CHLORIDE FROM LA FOSSA CRATER, VULCANO, AEOLIAN ISLANDS, ITALY
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
Steropesite, Tl 3 BiCl 6 , a new thallium bismuth chloride, was found in an active high-temperature fumarole (~450°C) on the rim at La Fossa crater, Vulcano, Aeolian Islands, Sicily, Italy. The mineral occurs as tabular or stout lemon-yellow crystals up to 0.20 mm in length in association with bismuthinite and lafossaite. The mineral is monoclinic, space group Cc (no. 9), with Z = 16; the unit-cell parameters are a 26.686(5), b 15.127(3), c 13.014(3) A, β 108.11(2)°, and V 4993(2) A 3 . The strongest six reflections in the X-ray powder-diffraction pattern [ d obs in A( I )( hkl) ] are: 3.773(100)(040), 2.113(93)(1200), 3.846(40)(332), 2.710(35)(442), 3.884(30)(402), and 2.745(30)(513). Chemical analyses obtained with an electron microprobe in wavelength dispersion gave, on average, Tl 54.57, Bi 23.40, Cl 17.42, Br 4.13, Na 0.02, K 0.01, for a total of 99.55 wt.%, corresponding to the empirical formula: (Tl 2.89 Na 0.01 ) ∑2.90 Bi 1.21 (Cl 5.32 Br 0.56 ) ∑5.88 . The calculated density for the compound with the above empirical formula is 5.737 g/cm 3 . The average index of refraction n is 1.97(2) (λ = 589 nm). The structure was refined from single-crystal X-ray-diffraction data to a final R of 0.052 for 6232 independent observed reflections [ I > 2σ( I )]. The asymmetric unit contains 4 Bi, 12 Tl and 24 Cl atoms. The bismuth atoms display a distorted octahedral coordination, with Bi–Cl distances in the range 2.618–2.789 A. Considering a maximum value of 3.6 A for the Tl–Cl distances, five of the twelve independent Tl atoms are six-coordinated (Tl–Cl in the range 3.023–3.596 A), six are seven-coordinated (Tl–Cl between 3.106 and 3.558 A), and one is eight-coordinated (Tl–Cl in the range 3.229–3.511 A). The structure can be compared with those of other hexachlorobismuthates[III], such as (NH 4 ) 3 BiCl 6 , Cs 3 BiCl 6 and CsK 2 BiCl 6 .
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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it