Braunerite

Where it forms, where it's found

Type locality: Svornost Mine
Jáchymov
Karlovy Vary District
Karlovy Vary Region
Czech Republic
50.3725°, 12.9114°

3recorded occurrences

Source · OpenStreetMap

Radioactivity

Crystallography

Crystal system: Monoclinic
Space group: P21/c
Cell parameters: a = 17.6725(12) Å · b = 11.6065(5) Å · c = 29.673(3) Å
Cell angles: β = 101.780(8) °
Ratio a:b:c: 1 : 0.657 : 1.679

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 17 15.999 271.983
40.21%
92UUranium Uranium 1 238.029 238.029
35.19%
19KPotassium Potassium 2 39.098 78.196
11.56%
20CaCalcium Calcium 1 40.078 40.078
5.92%
6CCarbon Carbon 3 12.011 36.033
5.33%
1HHydrogen Hydrogen 12 1.008 12.096
1.79%
Total 676.415 100.00%
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
8OOxygen	Oxygen	17	15.999	271.983	40.21%
92UUranium	Uranium	1	238.029	238.029	35.19%
19KPotassium	Potassium	2	39.098	78.196	11.56%
20CaCalcium	Calcium	1	40.078	40.078	5.92%
6CCarbon	Carbon	3	12.011	36.033	5.33%
1HHydrogen	Hydrogen	12	1.008	12.096	1.79%
	Total	676.415	100.00%

Synonyms

Brauneriet
IMA2015-123

In other languages

German: Braunerit · IMA 2015-123

Classification

Strunz

10th ed.

5.ED.55

5CarbonatesClass
5.EUranyl CarbonatesDivision
5.EDUO₂:CO₃ = 1:3Group
5.ED.55BrauneriteSpecies

Literature, links & citation

Citations

2016Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2016) New minerals and nomenclature modifications approved in 2016, CNMNC Newsletter no 31. Mineralogical Magazine, 80 (4) 691-697 doi:10.1180/minmag.2016.080.083DOI: 10.1180/minmag.2016.080.083
2022(2022) Braunerite. Handbook of Mineralogy. Mineralogical Society of America

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Braunerite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/braunerite-47780},
  note      = {Accessed 2026-05-11}
}