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Tennantite-(In) mineral

Tennantite-(In) is the approved tetrahedrite-group mineral species with ideal formula Cu6(Cu5In)As4S13 and IMA number 2023-011. It is distinct from elemental indium, other members of the tennantite series and the entire polymetallic ore. Voudouris and colleagues describe natural anhedral grains from the Pefka epithermal deposit in Greece, associated with roquesite, galena and tennantite-(Fe) in quartz. Their study reuses the sample investigated by Voudouris and colleagues in 2022, rather than establishing an independent occurrence. Backscattered-electron imaging, wavelength-dispersive electron-microprobe analyses and single-crystal X-ray diffraction support the mineral assignment. The seven selected chemical spot analyses near the extracted crystal are part of 86 analyses of the zoned specimen, not seven independent deposits or a bulk ore grade. The refined structural model supports indium at the tetrahedrally coordinated M(1) site; its formal trivalent state is interpreted from chemical and structural constraints rather than measured by a separate valence-sensitive assay. The natural compositions include substitutions and do not equal the ideal end-member formula. Possible intergrowths with lead-bearing phases limit interpretation of minor lead as lattice substitution. The reported powder diffraction pattern and density are calculated; powder diffraction and hardness were not measured on this scarce material. The proposed crystallization sequence and changing fluid conditions are geological interpretations, not controlled reaction experiments. Abstract and Table 3 uncertainties for lead and arsenic differ, so those conflicting uncertainties are not adopted as precise measurements here. No microbial mechanism, extraction yield, industrial recovery or constituent-derived criticality is assigned.

Identifiers & Classification

System Identifier Label
IMA IMA:2023-011 Tennantite-(In)

Sources & References

  1. ima_2026_09: IMA-CNMNC. The New IMA List of Minerals, September 2026; definitions on PDF page 1, terms on page 2 and Tennantite-(In) row on PDF page 214: Cu6(Cu5In)As4S13, A, 2023-011, Greece.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-12)
  2. voudouris2025: Voudouris P, Biagioni C, Sejkora J, Musetti S, Melfou M and Mavrogonatos C. Tennantite-(In), Cu6(Cu5In)As4S13, a new member of the tetrahedrite group from Pefka, Greece. DOI 10.1180/mgm.2025.10140, online 20 August 2025; Mineralogical Magazine 90(2), 417-426 (2026). Complete 24-page accepted preproof from the University of Pisa repository inspected, including all five figures and nine tables: sample reuse on page 2; occurrence and methods on pages 3-4; structural interpretation on pages 5-7; original Tables 3-8 and Figure 1. Final typeset PDF not inspected.
    https://doi.org/10.1180/mgm.2025.10140 (accessed 2026-10-12)
  3. pisa_postprint: University of Pisa ARPI repository, item 11568/1328568. Public author postprint of Voudouris and colleagues, DOI 10.1180/mgm.2025.10140; downloaded complete 24-page accepted preproof, not a separate study or a new occurrence.
    https://arpi.unipi.it/handle/11568/1328568 (accessed 2026-10-12)
  4. voudouris_cif: Voudouris and colleagues, supplementary material 1 to DOI 10.1180/mgm.2025.10140. Original publisher CIF inspected: natural Pefka specimen, structural model, site occupancies, refinement metadata and embedded reflection data; model-derived composition is distinct from the analytical and ideal formulas.
    https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0026461X25101400/resource/name/S0026461X25101400sup001.cif (accessed 2026-10-12)
  5. voudouris_spots: Voudouris and colleagues, supplementary material 2 to DOI 10.1180/mgm.2025.10140. Original publisher workbook inspected: tennantite-(In)_holotype contains seven selected spot analyses; tennantite-(In)_other data contains 79 additional analyses, all labelled PfV22G. These are related specimen-level observations, not independent occurrences or an extraction dataset.
    https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0026461X25101400/resource/name/S0026461X25101400sup002.xlsx (accessed 2026-10-12)

Curation History

Timestamp Curator Action Summary
2026-10-12T05:59:36Z codex (GPT-6; codex) CREATE Created the distinct mineral identity and qualified natural-specimen context from current IMA authority, complete accepted manuscript and original supplements. Preserved specimen reuse, analytical uncertainty and inferred formation limits without a microbial mechanism or inherited criticality.

Record source: data/records/tennantite-in.yaml