Rameauite Mineral Data + Say RAMEAUITE


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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.
 

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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: MonoclinicSpace 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
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:

relectron=4.75 gm/cc
note: rRameauite =5.60 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00521
Boson Index = 0.99479
Help on Photoelectric: Photoelectric:

PERameauite =1,884.57 barns/electron
U=PERameauite x relectron=8,948.23 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 5,088,214.87 (Gamma Ray American Petroleum Institute Units)

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 126,022,252 3.41E-03 5,088,214.87 1,672.84
100 gm / 3.24 cm 12,602,225 3.41E-04 508,821.49 167.28
10 gm / 1.51 cm 1,260,223 3.41E-05 50,882.15 16.73
1 gm / 6.99 mm 126,022 3.41E-06 5,088.21 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: 5.5.2.1 (5)Oxides Containing Uranium and Thorium
  (5.5)with alkaline and alkaline-earth elements (hydrated)
  (5.5.2)Dana Group
 
5.5.2.1 Rameauite K2CaU6O20·9(H2O) C 2/c,Cc Mono
Help on  Strunz Class: Strunz Class: IV/H.02-20 IV - Oxides
  IV/H - Uranyl ([UO2]2+) hydroxides and hydrates
  IV/H.02 - Agrinierite - Rameauite series
 
IV/H.02-10 Agrinierite (K2,Ca,Sr)U3O10·4(H2O) C mmm 2/m 2/m 2/m
 
IV/H.02-20 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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

Rameauite

K2CaU++++++6O20·9(H2O)
Dana No: 5.5.2.1 Strunz No: IV/H.02-20
Locality:

 

Notes:

 

 
   
 
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