Thalliomelane

Where it forms, where it's found

Geological setting: Fills small fractures and voids in the sandy limestone host rock.
Type locality: Zalas quarry
Gmina Krzeszowice
Kraków County
Lesser Poland Voivodeship
Poland
50.0843°, 19.6444°

1recorded occurrences

Source · OpenStreetMap

Safety & handling

Physical

Density: 5.285 g/cm³

Crystallography

Crystal system: Tetragonal
Space group: I4/m
Cell parameters: a = 9.866(12) Å · c = 2.8721(4) Å
Z: 1
Type-locality form: Fibrous and highly porous aggregates, <50 μm in size; rare.

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
25MnManganese Manganese 7.5 54.938 412.035
45.57%
8OOxygen Oxygen 16 15.999 255.984
28.31%
81TlThallium Thallium 1 204.380 204.380
22.61%
29CuCopper Copper 0.5 63.546 31.773
3.51%
Total 904.172 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From IMA formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
25MnManganese	Manganese	7.5	54.938	412.035	45.57%
8OOxygen	Oxygen	16	15.999	255.984	28.31%
81TlThallium	Thallium	1	204.380	204.380	22.61%
29CuCopper	Copper	0.5	63.546	31.773	3.51%
	Total	904.172	100.00%

Synonyms

IMA2019-055

In other languages

German: IMA 2019-055 · Thalliomelan
Italian: Talliomelano

Classification

Strunz

10th ed.

4.DK.K

4OxidesClass
4.DMetal: Oxygen = 1:2 and similarDivision
4.DKWith large (+- medium-sized) cations; tunnel structuresGroup
4.DK.KThalliomelaneSpecies

Group, growth & confusion

7 members

Literature, links & citation

Citations

2015Gołębiowska, Bożena, Rzepa, Grzegorz, Pieczka, Adam (2015) Exceptional Tl-bearing manganese oxides from Zalas, Krakow area, southern Poland. Mineralogia, 46 (1). 3-17 doi:10.1515/mipo-2016-0002DOI: 10.1515/mipo-2016-0002
2019Pekov, I. V., Zubkova, N. V., Agakhanov, A. A., Belakovskiy, D. I., Vigasina, M. F., Yapaskurt, V. O., Britvin, S. N., Turchkova, A. G., Sidorov, E. G., Pushcharovsky, D. Y. (2019) CNMNC Newsletter No. 52, New minerals and nomenclature modifications approved in 2019. Mineralogical Magazine, 83 (6) 887-893 doi:10.1180/mgm.2019.73DOI: 10.1180/mgm.2019.73
2021(2021) Thalliomelane. Handbook of Mineralogy. Mineralogical Society of America
2021Gołębiowska, Bożena, Pieczka, Adam, Zubko, Maciej, Voegelin, Andreas, Göttlicher, Jörg, Rzepa, Grzegorz (2021) Thalliomelane, TlMn⁴⁺_7.5Cu²⁺_0.5O₁₆, a new member of the coronadite group from the preglacial oxidation zone at Zalas, southern Poland. American Mineralogist, 106 (12) 2020-2027 doi:10.2138/am-2021-7577DOI: 10.2138/am-2021-7577

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Thalliomelane — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/thalliomelane-54020},
  note      = {Accessed 2026-05-11}
}