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Bismuthinite mineral

Bismuthinite is the orthorhombic Bi2S3 mineral species, listed with grandfathered status G and original-description year 1832 in the September 2026 IMA list. It is distinct from elemental bismuth, bismuth oxides, bismuth selenides or tellurides, and an uncharacterized material described only by nominal Bi2S3 composition. The experiment below concerns a synthetic phase assigned to bismuthinite by powder XRD, not a natural ore feed. No constituent criticality designation or microbial activity is inferred.

Microbial & Biochemical Mechanisms (1)

Abiotic aqueous precipitation and morphological development of synthetic bismuthinite

other

Aqueous bismuth nitrate, thioglycolic acid and thioacetamide produced solids whose powder diffraction patterns were assigned to orthorhombic bismuthinite. Representative products prepared at 25 and 70 degrees C showed different aggregated morphologies after reaction and digestion. This is laboratory chemical synthesis; it does not demonstrate microbial mineral formation, extraction of bismuth from natural ore or waste, or industrial recovery.

Experimental Context & Analytical Limits:
Section 2.1 and Figure 1 describe separate preparation of a 0.1 M thioacetamide stock and bismuth nitrate dissolved in thioglycolic acid, addition of water, 15-minute equilibration at 25 or 70 degrees C, mixing, and 60-minute reaction at the selected temperature. Heating was then stopped for a 24-hour digestion, described in Section 3.2 as occurring at room temperature. The supernatant was poured off, sediment washed to neutral pH and dried at 70 degrees C. No cells or microbial biomass were used. Exact bismuth and thioglycolic-acid quantities and the full composition matrix of the four reported series are not given; a final concentration or complete reproducible recipe is not inferred.
Curated Evidence Points:
Sections 2.2 and 3.1 and Figure 2 show powder XRD for representative BiSTAX samples prepared at 25 degrees C and BiS10X samples prepared at 70 degrees C, compared with bismuthinite reference card 00-006-0333. The authors assigned the detected reflections to bismuthinite and reported no additional crystalline-phase peaks. This supports the source-assigned synthetic phase, not quantitative purity, an amorphous-phase exclusion or a recovery yield; no phase-fraction refinement or detection limit is supplied.
Sections 2.2 and 3.1 report a 15-40 nm crystallite-size range estimated using diffraction peak widths and the Scherrer equation. Figures 3-4 show larger aggregated structures by SEM, with sponge-, dandelion- and flower-like forms among the representative samples. The diffraction-derived crystallite estimate is not an independently measured primary-particle size distribution, product mass balance or isolated-bismuth recovery percentage.
Section 3.2 and Figure 5 propose sequential assembly, Ostwald ripening, redissolution and reshaping from selected SEM morphologies. They do not directly track a single structure through those stages or isolate each proposed cause with omission controls. The authors explicitly say thioglycolic acid's directing role is unclear, despite earlier wording attributing morphology differences to its content. Section 2.1 gives a minimum reported reaction time of about 3 minutes, whereas Section 3.2 describes an aliquot taken about 1 minute after precipitation began; these early-time statements are not silently reconciled.
Only representative products from the stated four series are presented; experimental replicate counts and uncertainty for the morphology/size summaries are not specified. Washing and 70-degree drying precede powder characterization, so the final powder alone does not isolate the wet-precipitation morphology. Claims of high purity, high surface area, low toxicity or potential sensing/catalytic usefulness are not adopted as measured purity, surface-area, toxicity or application-performance results. No microbial comparison, natural-feed extraction or industrial deployment is tested.

Sources & References

  1. ima_2026_09: IMA-CNMNC. The New IMA List of Minerals, September 2026. Bismuthinite row, PDF page 26, and page 1 definitions of status G and original-description year. Retained issuing original re-inspected.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-14)
  2. handbook_bismuthinite: Handbook of Mineralogy. Bismuthinite, version 1 (2001-2005). Complete one-page species entry, formula and orthorhombic structure.
    https://www.handbookofmineralogy.org/pdfs/bismuthinite.pdf (accessed 2026-10-14)
  3. carrasco_gonzalez_2024: Carrasco-Gonzalez, Ortega-Amaya, Diaz-Torres, Perez-Guzman and Ortega-Lopez (2024). Low-Temperature Synthesis of Bi2S3 Hierarchical Microstructures via Co-Precipitation and Digestive Process in Aqueous Medium. Materials 17(8), 1818. Complete ten-page original, Experimental Procedures and Results, Figures 1-5; no separate supplement listed in inspected PDF/JATS, and data availability states data are within the article.
    https://doi.org/10.3390/ma17081818 (accessed 2026-10-14)

Curation History

Timestamp Curator Action Summary
2026-10-14T22:55:11.480581Z codex (GPT-6; codex) CREATE Created an authority-grounded mineral owner with complete primary abiotic synthesis evidence, explicit phase and causal limits, and deferred microbial sources; no inherited criticality or recovery yield.

Record source: data/records/bismuthinite.yaml