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Lithiophilite mineral

Lithiophilite is the lithium manganese(II) phosphate mineral LiMn2+(PO4), listed by IMA-CNMNC in September 2026 as grandfathered with original-description year 1878, not an approval identifier. It is distinct from Fe2+-dominant triphylite, synthetic battery materials of unspecified phase and oxidized lithium-deficient group members. Losey2004 measured natural Mn-rich crystals from the Bennett Quarry, Maine, and Fillow Quarry, Branchville, Connecticut, using microprobe and single-crystal diffraction in orthorhombic space group 62 (Pbnm setting; Handbook Pmnb is another setting). Natural samples contain substitutional Fe and are not pure endmembers. Lithium in that study was constrained or assumed rather than independently measured. The separate Schmid-Beurmann2013 oxidation assay used a laboratory-synthesized, diffraction-assigned LiMnPO4 powder and found no detected phase or lattice change under one specified treatment. That conditional null does not establish universal resistance to lithium dissolution. Neither source demonstrates microbial transformation, isolated lithium recovery or inherited criticality.

Microbial & Biochemical Mechanisms (1)

No detected phase conversion in one abiotic oxidation treatment

redox transformation

A synthetic, diffraction-assigned lithiophilite powder retained its reported phase and lattice parameters after a particular permanganate-acid hydrothermal treatment. The finding limits an oxidation claim for this arm; it does not demonstrate that no lithium entered solution, that no minor surface reaction occurred, or that all lithiophilite is chemically inert. The same study's natural-triphylite transformation is curated separately in cmmmech:triphylite, with unmatched conditions explicitly preserved.

Experimental Context & Analytical Limits:
Methods page 502 describes synthesis from Li3PO4, Mn2P2O7 and MnO and powder-diffraction identification of LiMnPO4. The stated 700 degrees C for 2 days refers to preparation of the Li3PO4 precursor, not an established final LiMnPO4 firing schedule. Table 1 assigns Tri-74 to 49.7 mg of synthetic powder, 10.5 mg KMnO4 and 1 mL of 0.1 N HCl in a closed 3-cm3 Teflon-lined vessel at 120 degrees C for 28 days, without oxygen buffering. The source describes the fine synthetic grains as less than 10 micrometres. Products were separated, water-washed and dried at 50 degrees C. No microbes, matched acid-only control, independent replicate number or before/after dissolved-lithium balance is reported.
Curated Evidence Points:
This evidence refutes detected bulk phase conversion in Tri-74, not every possible redox or dissolution process. Table 1 (page 503), Table 4 (page 506), Results page 511 and Discussion page 513 report retained lithiophilite, no detected phase-composition or lattice-parameter change, and a Rietveld fit with Rwp of 12.4%. The authors infer that manganese was not oxidized to the trivalent state under their test. No direct Mn-valence measurement or solution lithium assay is presented for this arm, so that inference is not strengthened into proof of zero oxidation or zero lithium release.
The natural-triphylite Tri-77/Tri-87 arms used approximately 20-21 mg KMnO4 for 8 days, compared with 10.5 mg for 28 days in Tri-74; particle form and composition also differed. Their outcomes therefore cannot establish a matched intrinsic species effect. The lithiophilite reference-card numbers differ between Methods and Table 1, and its b parameter differs slightly between Tables 4 and 5; no exact lattice value or phase-purity percentage is adopted here. The absence of detected bulk changes does not supply a lithium extraction denominator or product yield.
Context_only Source: losey2004
Tables 1-2 (pages 1107 and 1108), Figures 1-7 and Methods pages 1108-1109 establish the natural-crystal structural series. The Mn-rich Trip06 and Trip27 specimens are distinct from the synthesized Tri-74 powder. Assumed Li2O and fixed Li occupancy limit independent lithium quantification; the near-equal Fe/Mn Trip50 crystal is not treated as an unambiguous lithiophilite endmember. These crystal refinements are identity evidence, not a measured biological mechanism or lithium diffusion assay.
Context_only Source: lyalina2023
Tables 1-3 and the approved classification algorithm preserve lithiophilite as the Li-Mn2+ species while discrediting historical sicklerite/ferrisicklerite intermediate names. Valence and lithium-site occupancy matter for oxidized members, so total Fe/Mn composition or a commercial LiMnPO4 label alone does not assign every specimen. This nomenclatural assessment is separate from the 2013 experimental null.

Sources & References

  1. ima_2026_09: IMA-CNMNC. The New IMA List of Minerals, September 2026. PDF page 127, Lithiophilite row LiMn2+(PO4), G, 1878; page 1 defines grandfathered status and original-description year.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-15)
  2. handbook_lithiophilite: Handbook of Mineralogy. Lithiophilite, Li(Mn2+,Fe2+)PO4. Complete one-page identity, orthorhombic Pmnb structure, chemistry and natural occurrence entry.
    https://www.handbookofmineralogy.org/pdfs/lithiophilite.pdf (accessed 2026-10-15)
  3. losey2004: Losey A, Rakovan J, Hughes JM, Francis CA, Dyar MD (2004). Structural variation in the lithiophilite-triphylite series and other olivine-group structures. Canadian Mineralogist 42:1105-1115. Complete eleven-page original, Tables 1-5 and Figures 1-7; underlying CISTI-deposited structure factors and anisotropic parameters were not acquired.
    https://doi.org/10.2113/gscanmin.42.4.1105 (accessed 2026-10-15)
  4. schmid_beurmann2013: Schmid-Beurmann P, Ottolini L, Hatert F, Geisler T, Huyskens M, Kahlenberg V (2013; online 2012). Topotactic formation of ferrisicklerite from natural triphylite under hydrothermal conditions. Mineralogy and Petrology 107:501-515. Complete fifteen-page original, Tables 1-9 and Figures 1-5. Historical product nomenclature is qualified using Lyalina2023.
    https://doi.org/10.1007/s00710-012-0250-6 (accessed 2026-10-15)
  5. lyalina2023: Lyalina LM, Selivanova EA, Hatert F (2023). Nomenclature of the triphylite group of minerals. European Journal of Mineralogy 35:427-437. Complete original, Tables 1-3, Figures 1-5 and Algorithm 1; official supplement title page and native Supplement.xlsx inspected. The October 2022 CNMNC-approved scheme discredits ferrisicklerite and sicklerite; Table 3 recalculates the same 2013 samples rather than reporting a new oxidation experiment.
    https://doi.org/10.5194/ejm-35-427-2023 (accessed 2026-10-15)

Curation History

Timestamp Curator Action Summary
2026-10-15T10:30:56.463535+00:00 codex (GPT-6; codex) CREATE Added current mineral identity and a narrowly scoped abiotic hydrothermal experiment, preserving natural-versus-synthetic provenance, conditional nulls, shared study lineage and updated nomenclature.
2026-10-15T10:44:52.591233Z codex (GPT-6; codex) EDIT Corrected Losey2004 Table2 source locator from page1109 to1108 after independent finding F1 and issue327; scientific statements unchanged.

Record source: data/records/lithiophilite.yaml