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Ca(UO2)2(VO4)2 · 5-8H2O
Canary yellow, ...
1½ - 2
Member of:
Named in 1912 by Konstantin Avtonomovich Nenadkevich after its discovery locality, Tyuya-Muyun, Fergana Valley, Kyrgyzstan.
Isostructural with:
Carnotite Group.

A secondary mineral occurring in the oxidized zones of U-V deposits, especially those of the Colorado Plateau-type.

Visually indistinguishable from metatyuyamunite and other uranyl vanadates. Tyuyamunite easily dehydrates in dry atmosphere to metatyuyamunite and the original chemical analysis corresponds to metatyuyamunite.

Classification of Tyuyamunite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates

2a : AB2(XO4)2·xH2O, containing (UO2)2+

21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni URL:
Please feel free to link to this page.

First Recorded Occurrence of Tyuyamunite

General Appearance of First Recorded Material:
Veinlet fillings, disseminated in the limestone or as fillings in karst caverns.
Place of Conservation of First Recorded Material:
A.E. Fersman Mineralogical Museum, Moscow, Russia: #3575 through 3577.
Year of Discovery:
Geological Setting of First Recorded Material:
Carboniferous limestone
Associated Minerals at First Recorded Locality:

Occurrences of Tyuyamunite

Geological Setting:
Oxidized zone Colorado Plateau uranium deposits

Physical Properties of Tyuyamunite

Adamantine, Waxy, Pearly, Dull
Diaphaneity (Transparency):
Translucent, Opaque
Pearly on cleavage {001}, waxy or dull when massive.
Canary yellow, lemon-yellow; greenish yellow (upon exposure to sunlight); colourless to pale yellow in transmitted light.
Hardness (Mohs):
1½ - 2
Perfect on {001}, micaceous; distinct on {100} & {010}.
3.57 - 4.35 g/cm3 (Measured)    3.59 g/cm3 (Calculated)

Crystallography of Tyuyamunite

Crystal System:
Cell Parameters:
a = 10.63Å, b = 28.36Å, c = 20.4Å
a:b:c = 0.375 : 1 : 0.719
Unit Cell Volume:
V 6,149.92 ų (Calculated from Unit Cell)
Crystals elongated, platy, flattened on {001}, elongated [010], with {010}, {110}, and several other forms; may be curved or scaly. Also occurs as fanlike or radial aggregates, as thin films, coatings, pulverulent, and compact to cryptocrystalline massive impregnations.

Optical Data of Tyuyamunite

Biaxial (-)
RI values:
nα = 1.675 nβ = 1.860 - 1.870 nγ = 1.885 - 1.895
Measured: 30° to 45°, Calculated: 34°
Max Birefringence:
δ = 0.210 - 0.220
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
X = Nearly colourless
Y = Pale canary yellow
Z = Canary yellow

Chemical Properties of Tyuyamunite

Ca(UO2)2(VO4)2 · 5-8H2O
Essential elements:
All elements listed in formula:

Relationship of Tyuyamunite to other Species

Member of:
Other Members of Group:
CarnotiteK2(UO2)2(VO4)2 · 3H2O
SengieriteCu2(UO2)2(VO4)2 · 6H2O
StrelkiniteNa2(UO2)2(VO4)2 · 6H2O
4.HB.05CarnotiteK2(UO2)2(VO4)2 · 3H2O
4.HB.05Margaritasite(Cs,K,H3O)2(UO2)2(VO4)2 · H2O
4.HB.10SengieriteCu2(UO2)2(VO4)2 · 6H2O
4.HB.15CurienitePb(UO2)2(VO4)2 · 5H2O
4.HB.15Francevillite(Ba,Pb)(UO2)2(VO4)2 · 5H2O
4.HB.15FritzscheiteMn(UO2)2(PO4,VO4)2 · 10H2O (?)
4.HB.20MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2O
4.HB.20VanuraliteAl(UO2)2(VO4)2(OH) · 11H2O
4.HB.25MetatyuyamuniteCa(UO2)2(VO4)2 · 3-5H2O
4.HB.30StrelkiniteNa2(UO2)2(VO4)2 · 6H2O
4.HB.35UvaniteU26+V65+O21 · 15H2O (?)
4.HB.40RauviteCa(UO2)2(V10O28) · 16H2O
21.4.1UvaniteU26+V65+O21 · 15H2O (?)
21.4.2Vanuranylite(H3O)2(UO2)2(VO4)2 · 4H2O
21.4.3StrelkiniteNa2(UO2)2(VO4)2 · 6H2O
21.4.4CarnotiteK2(UO2)2(VO4)2 · 3H2O
21.4.5Margaritasite(Cs,K,H3O)2(UO2)2(VO4)2 · H2O
21.4.6SengieriteCu2(UO2)2(VO4)2 · 6H2O
21.4.7MetatyuyamuniteCa(UO2)2(VO4)2 · 3-5H2O
21.4.9RauviteCa(UO2)2(V10O28) · 16H2O
21.4.10Francevillite(Ba,Pb)(UO2)2(VO4)2 · 5H2O
21.4.11MetavanuraliteAl(UO2)2(VO4)2(OH) · 8H2O
21.4.12VanuraliteAl(UO2)2(VO4)2(OH) · 11H2O
21.4.13CurienitePb(UO2)2(VO4)2 · 5H2O
21.4.14FritzscheiteMn(UO2)2(PO4,VO4)2 · 10H2O (?)
21.4.16Santafeite(Na,Ca,Sr)12(Mn2+,Fe3+,Al,Mg)8Mn84+(VO4)16(OH,O)20 · 8H2O
21.4.22SchubneliteFe3+VO4 · H2O
21.4.23FervaniteFe43+V45+O16 · 5H2O
21.4.24KazakhstaniteFe53+V34+V125+O39(OH)9 · 9H2O
21.4.25Bokite(Al,Fe3+)1.3(V5+,V4+,Fe3+)8O20 · 7.4H2O
21.4.26Rusakovite(Fe3+,Al)5(VO4,PO4)2(OH)9 · 3H2O
21.4.27KolovratiteNixZny(VO4)0.67(x+y) · nH2O

Other Names for Tyuyamunite

Name in Other Languages:

Other Information

IR Spectrum:
Weak yellow-green at times (UV).
Other Information:
Radioactive. The water content is partly zeolitic and varies markedly with humidity at ambient temperatures. Insoluble in dilute acetic acid; soluble in HCl, HNO3 and H2SO4.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tyuyamunite

Reference List:
Nenadkevič (1912) Bulletin of the Academy of St. Petersburg (1912), [6], 6, 945.

Hillebrand (1913) American Journal of Science: 35: 440 (as Calciocarnotite).

Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 148.

Hess (1924) U.S. Geological Survey Bulletin 750D: 73 (Ross in).

Hillebrand (1924) American Journal of Science: 8: 201.

Chirvinsky (1925) Mineralogical Magazine: 20: 287-295.

Chlopin (1925) Comptes rendus de académie des sciences Russie: 73

Dolivo-Dobrovolsky (1925) Mineralogicheskoe Obshchestvo, Leningrad, Zapiski: [2]: 54: 359.

Izvestiya Imperatorskoy Akademii Nauk series 6: 15: 945-946.

Hintze, Carl (1931) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4B]: 1005.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1045-1047.

Frondel, C. (1958) Systematic mineralogy of uranium and thorium. U.S. Geological Survey Bull. 1064, 248–253.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1965): 94: 441.

Pekov, I.V. (1998) Minerals first discovered on the territory of the former Soviet Union, 220–221.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 608.

Internet Links for Tyuyamunite

Localities for Tyuyamunite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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