Kollerite

(NH4)2Fe3+(SO3)2(OH) · H2O
IMA status
  • Approved
IMA symbol
Klr
IMA approved
2019
Also known as
  • IMA2018-131
  • Kolleriet

Where it forms, where it's found

Geological setting

Burning waste dumps of a coal mine.

Type locality
Pécs-Vasas
  1. Pécs District
  2. Baranya County
  3. Hungary

46.1583°, 18.3203°

1recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789102/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Transparency
Translucent
Colour
Yellow
Streak
Pale yellow
Tenacity
brittle
Cleavage
None Observed
Fracture
Irregular/Uneven
Density
2.07 g/cm³

Crystallography

Crystal system
Orthorhombic
Space group
Cmcm
Cell parameters
a = 17.803(7) Å · b = 7.395(4) Å · c = 7.096(3) Å
Ratio a:b:c
1 : 0.415 : 0.399
Z
4
Type-locality form

Sprays of long-prismatic or lath-like crystals up to 0.7 mm.

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen815.999127.992
44.59%
16SSulfurSulfur232.06064.120
22.34%
26FeIronIron155.84555.845
19.45%
7NNitrogenNitrogen214.00728.014
9.76%
1HHydrogenHydrogen111.00811.088
3.86%
Total287.059100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2018-131
  • Kolleriet

In other languages

German
IMA 2018-131 · Kollerit

Classification

Strunz
10th ed.

4.JE.25

  • 4OxidesClass
  • 4.JArsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodatesDivision
  • 4.JESulfitesGroup
  • 4.JE.25KolleriteSpecies

Literature, links & citation

Citations
  1. 2019Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) New minerals and nomenclature modifications approved in 2019. CNMNC Newsletter No 48. Mineralogical Magazine, 83 (2) 315-317 doi:10.1180/mgm.2019.23DOI: 10.1180/mgm.2019.23
  2. 2021Ende, M., Effenberger, H., Fehér, B., Sajó, I., Kótai, L., Szakáll, S. (2021) Kollerite, (NH4)2Fe3+(SO3)2(OH)·H2O, a new sulfite mineral. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 167, 88 (abs.).
  3. 2021Fehér, B., Sajó, I., Kótai, L., Szakáll, S., Ende, M., Effenberger, H., Mihály, J. and Szabó, D. (2021) Three New Ammonium-iron-sulfite Phases from a Burning Dump of the Vasas Abandoned Opencast Coal Mine, Pécs, Mecsek Mts., Hungary. Acta Mineralogica-Petrographica, Abstract Series, Szeged, 11, 11.
  4. 2022(2022) Kollerite. Handbook of Mineralogy. Mineralogical Society of America
  5. 2023Fehér, Béla, Szakáll, Sándor, Ende, Martin, Effenberger, Herta S., Mihály, Judith, Sajó, István, Kótai, László, Szabó, Dávid (2023) Three ammonium-iron-sulfite phases from a burning dump of the Vasas abandoned opencast coal mine (Pécs, Mecsek Mountains, Hungary) and the new mineral kollerite. Mineralogy and Petrology, 117 (2) 231-245 doi:10.1007/s00710-023-00818-1DOI: 10.1007/s00710-023-00818-1
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Kollerite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/kollerite-53409},
  note      = {Accessed 2026-05-11}
}