Where it forms, where it's found
- Geological setting
Secondary mineral in a uranium deposit.
- Type locality
- Dzhentuar U deposit
- Auminzatau Mountains
- Central Kyzylkum Region
- Navoiy
- Uzbekistan
6recorded occurrences
Radioactivity
Physical
- Transparency
- Translucent
- Colour
- Green to dark green
Optical
- Optical type
- Biaxial (-) · 2V measured = Small°
- Refractive index
- 1.7 – 1.731
- Surface relief
- High
- Principal indices
- nα 1.700 · nβ 1.726 – 1.729 · nγ 1.729 – 1.731
- Pleochroism
- Weak
In shades of green.
- Dispersion
- r > v strong
- Notes
Positive elongation.
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation300 nm
Order1st order
XPL colour
Crystallography
- Space group
- #49
- Cell parameters
- a = 6.96 Å · b = 9.07 Å · c = 12.27 Å
- Ratio a:b:c
- 1 : 1.303 : 1.763
- Unit cell volume
- 775 ų
- Z
- 8
- Type-locality form
Green to dark green tabular crystals and aggregates on quartz. Crystals are up to 8 μm long and 1.5 μm wide.
Chemical composition
Synonyms
- IMA1983-017
- Vyacheslaviet
In other languages
- German
- IMA 1983-017 · Vyacheslavit
- Italian
- Vyacheslavite
- Chinese
- 水羟磷铀矿
Classification
Strunz
10th ed.8.DN.20
- 8Phosphates, Arsenates, VanadatesClass
- 8.DPhosphates, etc. with additional anions, with H2ODivision
- 8.DNWith only large cationsGroup
- 8.DN.20VyacheslaviteSpecies
Dana
8th ed.40.04.08.03
- 40Hydrated Normal Phosphates, Arsenates and VanadatesClass
- 40.04(AB)5(XO4)2·xH2OType
- 40.04.08Ningyoite GroupGroup
- 40.04.08.03VyacheslaviteSpecies
CIM
—19.11.5
- 19PhosphatesClass
- 19.11Phosphates of UGroup
- 19.11.5VyacheslaviteSpecies
Literature, links & citation
Citations
- 1983Belova, L.N., Gorshkov, A.I., Ivanova, O.A., Sivtsov, A.V. & Boronikhin, V.A. (1983): New natural uranium(IV) phosphate. Doklady Akademii Nauk SSSR: 3, 1460-1462. (in Russian).
- 1984Belova, L.N., Gorshkov, A.I., Ivanova, O.A., Sivtsov, A.V., Lizorkina, L.I. & Voronikhan, V.A. (1984): Vyacheslavite U4+(PO4)(OH).nH2O - a new uranium phosphate. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 113(3): 360-365.
- 1984Belova, L.N., Gorshkov, A.I., Ivanova, O.A., Sivtsov, A.V., Lizorkina, L.I. & Voronikhan, V.A. (1984): Vyacheslavite U4+(PO4)(OH).nH2O - a new uranium phosphate. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 113(3): 360-365. (in Russian).
- 1985Dunn, Pete J., Fleischer, Michael, Langley, Richard H., Shigley, James E., Zilczer, Janet A. (1985) New mineral names. American Mineralogist, 70 (7-8) 871-881
- 2005(2005) Vyacheslavite. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Vyacheslavite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/vyacheslavite-4218},
note = {Accessed 2026-05-11}
}