Mineralogy Database

Rameauite Mineral Data

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General Rameauite Information

Help on Chemical  Formula: Chemical Formula: K2CaU++++++6O20•9(H2O)
Help on Composition: Composition: Molecular Weight = 2,028.57 gm
   Potassium   3.85 %  K     4.64 % K2O
   Calcium     1.98 %  Ca    2.76 % CaO
   Uranium    70.40 %  U    84.60 % UO3
   Hydrogen    0.89 %  H     7.99 % H2O
   Oxygen     22.87 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2CaU6O20•9(H2O)
Help on Environment: Environment: On pitchblende.
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Margnac uranium deposit, Haute Vienne, Massif Central, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jacques Rameau (1926-1960), French prospector who discovered the deposit where the mineral occurs.
Help on Name Pronunciation: Name Pronunciation: Rameauite + Pronunciation Say RAMEAUITE
 

Rameauite Image

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  Rameauite

Comments: Yellow crystals of rameauite on matrix.
Location: Marignac, Compreignac, Haute Vienne, France. Scale: Picture Size 4 mm.
© Thomas Witzke

Rameauite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9796:1:0.9971
Help on Cell Dimensions: Cell Dimensions: a = 13.97, b = 14.26, c = 14.22, Z = 4; beta = 121.02° V = 2,427.67 Den(Calc)= 5.55
Help on Crystal System: Crystal System: Monoclinic Space Group: C 2/c,Cc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.319(1), 3.495(1), 7.12(1),
 

Physical Properties of Rameauite

Help on Cleavage: Cleavage: {010} Good
Help on Color: Color: Orange.
Help on Density: Density: 5.6
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
 

Optical Properties of Rameauite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.208 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.219 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.173,KPDmeas= 0.1714,KC= 0.1419
Ncalc = 1.79
Help on Optical Data: Optical Data: Biaxial (?), b=1.95, g=1.97, , 2V(Meas)=32.
 

Calculated Properties of Rameauite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Rameauite =5.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052114308
Boson Index = 0.9947885692
Help on Photoelectric: Photoelectric: PERameauite =1,884.57 barns/electron
U=PERameauite x relectron=8,948.23 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,088,217.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Rameauite per GRapi unit = 196.53 (PPB)

Rameauite 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) 5.98 ± 1.49 grams of pure Rameauite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 597.79 ±149.45 grams of pure Rameauite .

Estimated Radioactivity from Rameauite - 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 / 6.99 cm 126,022,254 3.41E-03 5,088,217.22 1,672.84
100 gm / 3.24 cm 12,602,225 3.41E-04 508,821.72 167.28
10 gm / 1.51 cm 1,260,223 3.41E-05 50,882.17 16.73
1 gm / 6.99 mm 126,022 3.41E-06 5,088.22 1.67
0.1 gm / 3.24 mm 12,602 3.41E-07 508.82 0.17
0.01 gm / 1.51 mm 1,260 3.41E-08 50.88 0.02
0.001 gm / 0.70 mm 126 3.41E-09 5.09 0.00

Weight of pure Rameauite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.60 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
 

Rameauite Classification

Help on  Dana Class: Dana Class: 05.05.02.01 (05)Oxides Containing Uranium and Thorium
  (05.05)with alkaline and alkaline-earth elements (hydrated)
  (05.05.02)Dana Group
 
05.05.02.01 Rameauite K2CaU6O20•9(H2O) C 2/c,Cc Mono
Help on  Strunz Class: Strunz Class: 04.GB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.G - Uranyl Hydroxides
  04.GB -With additional cations (K, Ca, Ba, Pb, etc.); with mainly UO2(O,OH)5 pentagonal polyhedra
 
04.GB.05 Agrinierite (K2,Ca,Sr)U3O10•4(H2O) C mmm 2/m 2/m 2/m
 
04.GB.05 Compreignacite K2(UO2)6O4(OH)6•8(H2O) Pnmn 2/m 2/m 2/m
 
04.GB.05 Rameauite K2CaU6O20•9(H2O) C 2/c,Cc Mono
 

Other Rameauite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Rameauite :
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

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

Rameauite

K2CaU++++++6O20•9(H2O)
Dana No: 05.05.02.01 Strunz No: 04.GB.05
Locality:

 

Notes:

 

 
   
 


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