Plavnoite

Where it forms, where it's found

Type locality: Plavno mine
Hanušov
Ostrov
Karlovy Vary District
Karlovy Vary Region
Czech Republic
50.3553°, 12.9639°

1recorded occurrences

Source · OpenStreetMap

Radioactivity

Crystallography

Crystal system: Monoclinic
Space group: C2/m
Cell parameters: a = 8.6288(8) Å · b = 14.2755(9) Å · c = 8.8598(8) Å
Cell angles: β = 104.040(4) °
Ratio a:b:c: 1 : 1.654 : 1.027

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
92UUranium Uranium 2 238.029 476.058
59.85%
8OOxygen Oxygen 13.5 15.999 215.987
27.16%
25MnManganese Manganese 0.6 54.938 32.963
4.14%
16SSulfur Sulfur 1 32.060 32.060
4.03%
19KPotassium Potassium 0.8 39.098 31.278
3.93%
1HHydrogen Hydrogen 7 1.008 7.056
0.89%
Total 795.402 100.00%
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
92UUranium	Uranium	2	238.029	476.058	59.85%
8OOxygen	Oxygen	13.5	15.999	215.987	27.16%
25MnManganese	Manganese	0.6	54.938	32.963	4.14%
16SSulfur	Sulfur	1	32.060	32.060	4.03%
19KPotassium	Potassium	0.8	39.098	31.278	3.93%
1HHydrogen	Hydrogen	7	1.008	7.056	0.89%
	Total	795.402	100.00%

Synonyms

IMA2015-059
Plavnoiet

In other languages

German: IMA 2015-059 · Plavnoit

Classification

Strunz

10th ed.

7.EC.05

7SulfatesClass
7.EUranyl sulfatesDivision
7.ECWith medium-sized and large cationsGroup
7.EC.05PlavnoiteSpecies

Group, growth & confusion

9 members

Literature, links & citation

Citations

2015Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2015) New minerals and nomenclature modifications approved in 2015, CNMNC Newsletter No 27. Mineralogical Magazine, 79 (5). 1223-1230 doi:10.1180/minmag.2015.079.5.16DOI: 10.1180/minmag.2015.079.5.16
2017(2017) Plavnoite. Handbook of Mineralogy. Mineralogical Society of America
2017Plášil, Jakub, Škácha, Pavel, Sejkora, Jiří, Kampf, Anthony R., Škoda, Radek, Čejka, Jiří, Hloušek, Jan, Kasatkin, Anatoly V., Pavlíček, Radim, Babka, Karel (2017) Plavnoite, a new K–Mn member of the zippeite group from Jáchymov, Czech Republic. European Journal of Mineralogy, 29 (1) 117-128 doi:10.1127/ejm/2017/0029-2583 DOI: 10.1127/ejm/2017/0029-2583

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Plavnoite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/plavnoite-46833},
  note      = {Accessed 2026-05-11}
}