Mineralogy Database

Carnotite Mineral Data

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General Carnotite Information

Help on Chemical  Formula: Chemical Formula: K2(UO2)2V2O8•3(H2O)
Help on Composition: Composition: Molecular Weight = 902.18 gm
   Potassium   8.67 %  K    10.44 % K2O
   Uranium    52.77 %  U    59.86 % UO2
   Vanadium   11.29 %  V    20.16 % V2O5
   Hydrogen    0.67 %  H     5.99 % H2O
   Oxygen     26.60 %  O
             ______        ______ 
             100.00 %       96.45 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2(UO2)2(VO4)2•3(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1899
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French chemist, M. A. Carnot (1839-1920).
Help on Name Pronunciation: Name Pronunciation: Carnotite + Pronunciation Say CARNOTITE
 

Carnotite Image

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  Carnotite

Comments: Bright yellow, fluorescent crystals of carnotite on sandstone.
Location: Anderson Mine, Yavapai County, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Carnotite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2449:1:0.8216
Help on Cell Dimensions: Cell Dimensions: a = 10.47, b = 8.41, c = 6.91, Z = 2; beta = 103.667° V = 591.22 Den(Calc)= 5.07
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.56(1), 3.12(0.7), 3.53(0.5),
 

Physical Properties of Carnotite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellow, Golden yellow, Greenish yellow.
Help on Density: Density: 3.7 - 4.7, Average = 4.2
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light yellow
 

Optical Properties of Carnotite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.288 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1805,KPDmeas= 0.2179,KC= 0.1692
Ncalc = 1.63 - 1.86
Help on Optical Data: Optical Data: Biaxial (-), a=1.75-1.78, b=1.901-2.06, g=1.92-2.08, bire=0.1700-0.3000, 2V(Calc)=26-36, 2V(Meas)=43-60. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Carnotite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.43 gm/cc
note: Specific Gravity of Carnotite =5.07 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0042206952
Boson Index = 0.9957793048
Help on Photoelectric: Photoelectric: PECarnotite =1,373.99 barns/electron
U=PECarnotite x relectron=6,084.54 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,928,702.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Carnotite per GRapi unit = 254.54 (PPB)

Carnotite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 7.74 ± 1.94 grams of pure Carnotite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 774.22 ±193.55 grams of pure Carnotite .

Estimated Radioactivity from Carnotite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.22 cm 94,456,860 2.55E-03 3,928,702.45 1,291.63
100 gm / 3.35 cm 9,445,686 2.55E-04 392,870.25 129.16
10 gm / 1.56 cm 944,569 2.55E-05 39,287.02 12.92
1 gm / 7.22 mm 94,457 2.55E-06 3,928.70 1.29
0.1 gm / 3.35 mm 9,446 2.55E-07 392.87 0.13
0.01 gm / 1.56 mm 945 2.55E-08 39.29 0.01
0.001 gm / 0.72 mm 94 2.55E-09 3.93 0.00

Weight of pure Carnotite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.07 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Carnotite Classification

Help on  Dana Class: Dana Class: 40.02a.28.01 (40)Hydrated Phosphates, etc
  (40.02a)where A++ (B++)2 (XO4) � x(H2O), containing (UO2)++
  (40.02a.28)Dana Group
 
40.02a.28.01 Carnotite K2(UO2)2V2O8•3(H2O) P 21/a 2/m
 
40.02a.28.02 Margaritasite (Cs,K,H3O)2(UO2)2V2O8•(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 04.HB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HB -Uranyl Sorovanadates
 
04.HB.05 Carnotite K2(UO2)2V2O8•3(H2O) P 21/a 2/m
 
04.HB.05 Margaritasite (Cs,K,H3O)2(UO2)2V2O8•(H2O) P 21/a 2/m
 

Other Carnotite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Carnotite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Uranium Minerals
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Carnotite Specimen Label here :

Carnotite

K2(UO2)2V2O8•3(H2O)
Dana No: 40.02a.28.01 Strunz No: 04.HB.05
Locality:

 

Notes:

 

 
   
 


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