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Celestine mineral

Celestine, also called celestite in the primary study, is the orthorhombic strontium sulfate mineral SrSO4 in the barite group. It is distinct from strontianite, elemental strontium, mixed sulfate phases, strontium-containing solutions and the industrial baryte commodity. The September 2026 IMA list reports approved status with 1967 s.p.; this special-procedure notation is not a unique numbered mineral accession. The curated laboratory study identifies celestine alongside strontianite on cyanobacterial cell surfaces; no mineral-specific criticality designation, pure-phase recovery yield or industrial application is inferred.

Microbial & Biochemical Mechanisms (1)

Celestine-associated mineralization on Synechococcus GL24 surfaces

biomineralization Microbial

The source-designated cyanobacterium Synechococcus strain GL24 formed Sr-bearing mineral patches on its S-layer in illuminated artificial lakewater. Selected-area electron diffraction and elemental microanalysis supported celestine together with strontianite. Early patches were Sr- and S-bearing; later encrustations became more carbonate-dominated. This is culture-associated nucleation of mixed minerals from dissolved salts, not microbial dissolution of a starting celestine ore, a pure celestine product or proof of a particular celestine-to-strontianite reaction pathway.

Experimental Context & Analytical Limits:
GL24 was originally isolated from Fayetteville Green Lake, New York. The 1994 source provides this isolate designation but no sequence accession or independently verified strain-level taxon identifier; no modern species or strain CURIE is assigned. Artificial GL medium was prepared without Ca, Mg or Sr, then supplied with 10 mM Sr as the nitrate salt for the Sr-only arm, together with 10 mM Na2SO4 and 3.2 mM NaHCO3 in the base medium. The salt medium was filter sterilized through 0.2 micrometre nylon to avoid heat-induced carbonate precipitation, and acid-washed tubes were rinsed five times with high-purity water. Nine tubes each containing 9 mL were inoculated from a one-month-old culture to a reported final 10^6 cells/mL, with a tenth tube left uninoculated. Incubation was at 22 degrees C under Gro-lux fluorescent illumination of 20 microeinsteins per square metre per second. One tube was sacrificed at each of nine times from 4 to 288 h; this is not nine biological replicates per time. Whole-mount TEM, EDS and selected-area diffraction examined cell-associated minerals, while the remaining suspension was used for pH. Separate Ca/Mg/Sr competition arms had total divalent-cation concentration 10 mM. Those mixed-cation results are not pure-celestine experiments. Laboratory tubes, not natural-lake celestine production or deployed treatment, define the accepted scope.
Curated Evidence Points:
Methods and Results pp. 447-450, Figures 1-4, support early cell-surface mineral patches, increasing encrustation, initial pH rise, and celestine/strontianite assignments using selected-area diffraction and Sr/S microanalysis. The paper reports neither mineralization nor pH change in uninoculated controls. Figure 3A identifies an early Sr/S-bearing patch as celestine; Figure 3B and the increasing Sr/S ratio in Figure 4 support later strontianite dominance. Both mineral types occurred, so no phase-pure celestine yield or quantitative phase fraction is inferred.
Figure 4 averages five EDS stoichiometric determinations at each time, not independent culture replicates; changing Sr/S ratios do not by themselves quantify phase proportions or prove conversion of each original sulfate crystallite into carbonate. The selected diffraction spacings and spot analyses support the authors limited phase assignment, not modern full-pattern quantitative refinement. No killed-cell, isolated-S-layer or matched-pH chemical control in this experiment establishes the exclusive role of living metabolism versus surface nucleation and solution chemistry.
Figure 5 shows declining Sr in acidified cell-free supernatants; this does not measure a separated, purified celestine product or identify what fraction of removed Sr entered celestine rather than strontianite or surface-bound pools. The authors note that shed mineralized S-layers affect interpretation of supernatant cation measurements in comparison arms. Discussion pp. 451-452 proposes that Sr/Ca imbalance impairs photosynthesis and S-layer replacement, but does not directly demonstrate that causal sequence with viability or photosynthetic-rate measurements. Figures 6-7 illustrate S-layer structure and calcium/gypsum context; they are not additional celestine-specific experiments.

Sources & References

  1. ima_2026_09: IMA-CNMNC. The New IMA List of Minerals, September 2026; definitions pp. 1-2 and Celestine row PDF p. 39, Sr(SO4), A, 1967 s.p. Previously acquired dated authority re-inspected on 14 October 2026.
    https://cnmnc.units.it/files/editor/IMA_Master_List_(2026-09).pdf (accessed 2026-10-14)
  2. handbook: Handbook of Mineralogy. Celestine, version 1, 2001-2005; complete one-page identity entry, orthorhombic SrSO4 and barite-group membership.
    https://www.handbookofmineralogy.org/pdfs/celestine.pdf (accessed 2026-10-14)
  3. schultze1994: Schultze-Lam, Susanne and Beveridge, Terry J. (1994). Nucleation of Celestite and Strontianite on a Cyanobacterial S-Layer. Applied and Environmental Microbiology 60(2):447-453. DOI 10.1128/aem.60.2.447-453.1994; all seven original scanned pages, Methods pp. 447-448, Results pp. 448-450, Discussion pp. 450-452 and Figures 1-7. PMID 16349174; PMCID PMC201332.
    https://doi.org/10.1128/aem.60.2.447-453.1994 (accessed 2026-10-14)

Curation History

Timestamp Curator Action Summary
2026-10-14T12:27:08.176225+00:00 codex (GPT-6; codex) CREATE Created celestine mineral identity and primary laboratory biomineralization evidence with explicit phase, control, measurement and deployment limits; independent scientific review pending.

Record source: data/records/celestine.yaml