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Carnotite

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Anderson Mine (Date Creek project; U-V Mine; Uranium-Air Mine), Date Creek Basin, Yavapai Co., Arizona, USA
© Stephan Wolfsried

Show Carnotite Photos (24)
Formula:
K
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 3H
 
2
O
System:MonoclinicColour:Bright yellow, yellow, ...
Lustre:Silky, Dull, EarthyHardness:2
Name:Named for Marie-Adolphe Carnot (1839-1920), French mining engineer and chemist.


Carnotite Group.

A secondary mineral resulting from the alteration of Uraninite, Montroseite, or Davidite. Occurs in sandstones, especially in paleochannels, near fossil carbonaceous matter, in calcretes and near playas.

Classification of Carnotite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/E.11-50
Nickel-Strunz 10th (pending) edition ID:4.HB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
B : Uranyl Sorovanodates
Dana 8th edition ID:40.2a.28.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
Hey's CIM Ref.:21.4.4

21 : Vanadates (and vanadates with arsenate or phosphate)
4 : Vanadates of U, Mn, Fe or Ni
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Type Occurrence of Carnotite

Type Locality:Rajah Mine, Uravan District, Montrose Co., Colorado, USA
Place of Conservation of Type Material:University of Colorado, Boulder, Colorado: #2218. Harvard University, Cambridge, Massachusetts, USA: #106253.
Year of Discovery:1899

Occurrences of Carnotite

Geological Setting:Colorado Plateau type uranium deposits, near playas.

Physical Properties of Carnotite

Lustre:Silky, Dull, Earthy
Diaphaneity (Transparency):Semitransparent
Comment:Silky when crystalline
Colour:Bright yellow, yellow, greenish yellow
Streak:Strontian-yellow
Hardness (Mohs):2
Cleavage:Perfect
on {001}, perfect, micaceous
Fracture:Micaeous
Density (measured):4.7 g/cm3
Density (calculated):4.91 g/cm3

Crystallography of Carnotite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b (P1 1 21/b) [P21/c] {P1 21/c 1} {P21/a}
Cell Parameters:a = 10.47Å, b = 8.41Å, c = 6.91Å
β = 103.83°
Ratio:a:b:c = 1.245 : 1 : 0.822
Unit Cell Volume:V 590.80 ų (Calculated from Unit Cell)
Z:2
Morphology:Crystals rare, diamond-shaped, flattened {001} and rhomboidal {110}, also lath-like [010] with {100} and {110} or {120}; (110) ^ (110) ~78°; commonly as fine aggregates or pulverulent; disseminated, compact massive.
Twinning:On {001} as both the composition and twin plane.
Comment:Space group determined based on synthetic, anhydrous material.

Optical Data of Carnotite

Type:Biaxial (-)
RI values: nα = 1.750 nβ = 1.925 nγ = 1.950
2V:Measured: 43° to 60°, Calculated: 26° to 36°
Maximum Birefringence:δ = 0.200

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v
Pleochroism:Weak
Comments:X = Nearly colourless to pale grayish yellow
Y = Z = Canary yellow, lemon-yellow
Comments:Indices of refraction increase as water content decreases.

Chemical Properties of Carnotite

Formula:
K
 
2
(UO
 
2
)
 
2
[VO
 
4
]
 
2
 · 3H
 
2
O
Essential elements:H, K, O, U, V
All elements listed in formula:H, K, O, U, V

Relationship of Carnotite to other Species

Related to:
  • Carnotite Group
    • Common Associates:
    VolborthiteVanoxiteUvaniteTyuyamuniteTangeite
    RossiteRauvitePintadoiteMetatyuyamuniteMetatorbernite
    HewettiteGypsumBaryte
    Related Minerals - Nickel-Strunz Grouping):
    4.HB.05Margaritasite
    (Cs,K,H
     
    3
    		O)
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · H
     
    2
    		O
    4.HB.10Sengierite
    Cu
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
    4.HB.15Curienite
    Pb(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5H
     
    2
    		O
    4.HB.15Francevillite
    (Ba,Pb)(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5H
     
    2
    		O
    4.HB.15Fritzscheite
    Mn(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		,VO
     
    4
    		)
     
    2
    		·10H
     
    2
    		O (?)
    4.HB.20Metavanuralite
    Al(UO
     
    2
    		)
     
    2
    		[OH|(VO
     
    4
    		)
     
    2
    		] · 8H
     
    2
    		O
    4.HB.20Vanuralite
    Al(UO
     
    2
    		)
     
    2
    		[OH|(VO
     
    4
    		)
     
    2
    		] · 11H
     
    2
    		O
    4.HB.25Metatyuyamunite
    Ca(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 3-5H
     
    2
    		O
    4.HB.25Tyuyamunite
    Ca(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5-8H
     
    2
    		O
    4.HB.30Strelkinite
    Na
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
    4.HB.35Uvanite
    U
     
    2
    		V
     
    6
    		O
     
    21
    		·15H
     
    2
    		O
    4.HB.40Rauvite
    Ca(UO
     
    2
    		)
     
    2
    		V
     
    10
    		O
     
    28
    		·16H
     
    2
    		O
    Related Minerals - Hey's Index Grouping:
    21.4.1Uvanite
    U
     
    2
    		V
     
    6
    		O
     
    21
    		·15H
     
    2
    		O
    21.4.2Vanuranylite
    (H
     
    3
    		O)
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 4H
     
    2
    		O
    21.4.3Strelkinite
    Na
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
    21.4.5Margaritasite
    (Cs,K,H
     
    3
    		O)
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · H
     
    2
    		O
    21.4.6Sengierite
    Cu
     
    2
    		(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 6H
     
    2
    		O
    21.4.7Metatyuyamunite
    Ca(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 3-5H
     
    2
    		O
    21.4.8Tyuyamunite
    Ca(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5-8H
     
    2
    		O
    21.4.9Rauvite
    Ca(UO
     
    2
    		)
     
    2
    		V
     
    10
    		O
     
    28
    		·16H
     
    2
    		O
    21.4.10Francevillite
    (Ba,Pb)(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5H
     
    2
    		O
    21.4.11Metavanuralite
    Al(UO
     
    2
    		)
     
    2
    		[OH|(VO
     
    4
    		)
     
    2
    		] · 8H
     
    2
    		O
    21.4.12Vanuralite
    Al(UO
     
    2
    		)
     
    2
    		[OH|(VO
     
    4
    		)
     
    2
    		] · 11H
     
    2
    		O
    21.4.13Curienite
    Pb(UO
     
    2
    		)
     
    2
    		[VO
     
    4
    		]
     
    2
    		 · 5H
     
    2
    		O
    21.4.14Fritzscheite
    Mn(UO
     
    2
    		)
     
    2
    		(PO
     
    4
    		,VO
     
    4
    		)
     
    2
    		·10H
     
    2
    		O (?)
    21.4.15Palenzonaite
    (Ca,Na)
     
    3
    		CaMn
    2+
    2
    		[VO
     
    4
    		]
     
    3
    21.4.16Santafeite
    (Ca,Sr,Na)
     
    12
    		(Mn
    2+
     
    		,Fe
    3+
     
    		,Al,Mg)
     
    8
    		Mn
    4+
    8
    		(VO
     
    4
    		)
     
    16
    		(OH,O)
     
    20
    		 · 8H
     
    2
    		O
    21.4.17Pyrobelonite
    PbMn
    2+
     
    		[OH|VO
     
    4
    		]
    21.4.18Brackebuschite
    Pb
     
    2
    		(Mn
    3+
     
    		,Fe
    3+
     
    		)[OH|(VO
     
    4
    		)
     
    2
    		]
    21.4.19Čechite
    Pb(Fe
    2+
     
    		,Mn
    2+
     
    		)[OH|VO
     
    4
    		]
    21.4.20Heyite
    Pb
     
    5
    		Fe
    2+
    2
    		[O
     
    2
    		|VO
     
    4
    		]
     
    2
    21.4.21Mounanaite
    PbFe
    3+
    2
    		[VO
     
    4
    		]
     
    2
    		 · 2(OH,F)
    21.4.22Schubnelite
    Fe
     
    2-x
    		V
     
    2
    		O
     
    4
    		(OH)
     
    4
    21.4.23Fervanite
    Fe
     
    4
    		(VO
     
    4
    		)
     
    4
    		·5H
     
    2
    		O
    21.4.24Kazakhstanite
    Fe
     
    5
    		V
     
    3
    		V
     
    12
    		O
     
    39
    		(OH)
     
    9
    		·9H
     
    2
    		O
    21.4.25Bokite
    (Al,Fe
    3+
     
    		)
     
    1.3
    		[(V
    5+
     
    		,V
    4+
     
    		,Fe
    3+
     
    		)
     
    4
    		O
     
    10
    		]
     
    2
    		 · 7.5H
     
    2
    		O
    21.4.26Rusakovite
    (Fe
    3+
     
    		,Al)
     
    5
    		[(OH)
     
    9
    		|(VO
     
    4
    		,PO
     
    4
    		)
     
    2
    		] · 3H
     
    2
    		O
    21.4.27Kolovratite
    (Zn,Ni,Cu)
     
    2-5
    		Al
     
    4-6
    		(Si,V
    4+
     
    		,V
    5+
     
    		)
     
    4
    		(O,OH)
     
    20
    		·7.5H
     
    2
    		O

    Other Names for Carnotite

    Synonyms:
    Carnotite (of Friedel and Cumenge)
    German names:
    Carnotit
    Russian names:
    Карнотит
    Spanish names:
    Carnotita
    Varieties:
    Thallian Carnotite

    Other Information

    Other Information:Radioactive. Water content is partly zeolitic and varies with humidity at ambient temperatures. Readily soluble in acids.
    Health Warning:Contains uranium - always wash hands after handling. Avoid inhaling dust when handling or breaking. Never lick or ingest. Avoid prolonged exposure in proximity of the body. Store away from inhabited areas.
    Industrial Uses:Uranium ore

    References for Carnotite

    Reference List:Friedel and Cumenge (1899) Comptes rendu de l’Académie des sciences de Paris: 128: 532.

    Friedel and Cumenge (1899) Bulletin de la Société française de Minéralogie: 22: 26.

    Acta Crystallographica: 10: 765.

    Doelter, C. (1918) Handbuch der Mineral-chemie (in 4 volumes divided into parts): 3 [I]: 844.

    Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 52.

    Crook and Blake (1924) Mineralogical Magazine: 15: 271.

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

    Hess and Foshag (1927) Proceedings of the U.S. National Museum: 72, Art. 12.

    Hintze, Carl (1931) Handbuch der Mineralogie. Berlin and Leipzig. 6 volumes: 1 [4B]: 1002.

    Sundberg and Sillén (1949) Arkiv för Kemi, Mineralogi och Geologi, Stockholm: 1, no. 42: 337.

    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.: 1043-1045.

    Frondel, C. (1958) Systematic mineralogy of uranium and thorium. U.S. Geological Survey Bull. 1064, 243–247.

    Appleman, D.E. and H.T. Evans, Jr. (1965) The crystal structures of synthetic anhydrous carnotite, K2(UO2) V2O8, and its cesium analogue, Cs2(UO2)2V2O8. American Mineralogist: 50: 825–842.

    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.: 96.

    Internet Links for Carnotite

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    Localities for Carnotite

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