Mineralogy Database

Roubaultite Mineral Data

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General Roubaultite Information

Help on Chemical  Formula: Chemical Formula: Cu2(UO2)3(CO3)2O2(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 1,195.27 gm
   Uranium   59.74 %  U    67.77 % UO2
   Copper    10.63 %  Cu   13.31 % CuO
   Hydrogen   0.84 %  H     7.54 % H2O
   Carbon     2.01 %  C     7.36 % CO2
   Oxygen    26.77 %  O
            ______        ______ 
            100.00 %       95.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu2(UO2)3(CO3)2O2(OH)2•4(H2O)
Help on Environment: Environment: On pitchblende ore.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Shinkolobwe, Shaba, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Marcel Roubault (1905-), geologist, University of Nancy, France.
Help on Name Pronunciation: Name Pronunciation: Roubaultite + Pronunciation Say ROUBAULTITE
Help on Synonym: Synonym: ICSD 60064
  PDF 25-318
 

Roubaultite Image

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  Roubaultite

Comments: Lime green, granular roubaultite associated with pale yellow acicular uranophane.
Location: KOV mine, Kamoto, Shaba, Democratic Republic of Congo. Scale: See Image.
© Rruff Database

Roubaultite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.1188:1:1.1307
Help on Cell Dimensions: Cell Dimensions: a = 7.767, b = 6.942, c = 7.85, Z = 1; alpha = 92.16°, beta = 90.89°, gamma = 93.48° V = 422.13 Den(Calc)= 4.70
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.55(1), 7.74(0.9), 6.88(0.8),
 

Physical Properties of Roubaultite

Help on Cleavage: Cleavage: {100} Perfect, {010} Distinct
Help on Color: Color: Grass green, Apple green.
Help on Density: Density: 5.02
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: green
 

Optical Properties of Roubaultite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.176 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.256 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1652,KPDmeas= 0.1547,KC= 0.1316
Ncalc = 1.62 - 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=1.8, g=1.82-1.84, bire=0.1200-0.1400, 2V(Calc)=46-60, 2V(Meas)=55.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): yellow green.
 

Calculated Properties of Roubaultite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.33 gm/cc
note: Specific Gravity of Roubaultite =5.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0046523223
Boson Index = 0.9953476777
Help on Photoelectric: Photoelectric: PERoubaultite =1,575.08 barns/electron
U=PERoubaultite x relectron=6,826.85 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,396,769.70 (Gamma Ray American Petroleum Institute Units)
Concentration of Roubaultite per GRapi unit = 227.44 (PPB)

Roubaultite 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) 6.92 ± 1.73 grams of pure Roubaultite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 691.80 ±172.95 grams of pure Roubaultite .

Estimated Radioactivity from Roubaultite - 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 / 7.25 cm 106,939,622 2.89E-03 4,396,769.70 1,445.51
100 gm / 3.36 cm 10,693,962 2.89E-04 439,676.97 144.55
10 gm / 1.56 cm 1,069,396 2.89E-05 43,967.70 14.46
1 gm / 7.25 mm 106,940 2.89E-06 4,396.77 1.45
0.1 gm / 3.36 mm 10,694 2.89E-07 439.68 0.14
0.01 gm / 1.56 mm 1,069 2.89E-08 43.97 0.01
0.001 gm / 0.72 mm 107 2.89E-09 4.40 0.00

Weight of pure Roubaultite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.02 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
 

Roubaultite Classification

Help on  Dana Class: Dana Class: 16b.07.13.01 (16b)Carbonates - Hydroxyl or Halogen
  (16b.07)Dana Type
  (16b.07.13)Dana Group
 
16b.07.13.01 Roubaultite Cu2(UO2)3(CO3)2O2(OH)2•4(H2O) P1 1
Help on  Strunz Class: Strunz Class: 05.EA.25 05 - CARBONATES (NITRATES)
  05.E - Uranyl Carbonates
  05.EA -UO2:CO3 > 1:1
 
05.EA.25 Roubaultite Cu2(UO2)3(CO3)2O2(OH)2•4(H2O) P1 1
 

Other Roubaultite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Roubaultite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals
16 - WWW-MINCRYST

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Roubaultite

Cu2(UO2)3(CO3)2O2(OH)2•4(H2O)
Dana No: 16b.07.13.01 Strunz No: 05.EA.25
Locality:

 

Notes:

 

 
   
 


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