Rameauite Mineral Data (original) (raw)
General Rameauite Information
Chemical Formula:
K2CaU++++++6O20•9(H2O)
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
Empirical Formula:
K2CaU6O20•9(H2O)
Environment:
On pitchblende.
IMA Status:
Approved IMA 1972
Locality:
Margnac uranium deposit, Haute Vienne, Massif Central, France. Link to MinDat.org Location Data.
Name Origin:
Named for Jacques Rameau (1926-1960), French prospector who discovered the deposit where the mineral occurs.
Name Pronunciation:
Rameauite + Pronunciation 
Rameauite Image
Images:
 |
Rameauite Comments: Yellow crystals of rameauite on matrix. Location: Marignac, Compreignac, Haute Vienne, France.Scale: Picture Size 4 mm. © Thomas Witzke |
|---|
Rameauite Crystallography
Axial Ratios:
a:b:c =0.9796:1:0.9971
Cell Dimensions:
a = 13.97, b = 14.26, c = 14.22, Z = 4; beta = 121.02° V = 2,427.67 Den(Calc)= 5.55
Crystal System:
MonoclinicSpace Group: C 2/c,Cc
X Ray Diffraction:
By Intensity(I/Io): 3.319(1), 3.495(1), 7.12(1),
Physical Properties of Rameauite
Cleavage:
{010} Good
Color:
Orange.
Density:
5.6
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Pseudo Hexagonal - Crystals show a hexagonal outline.
Optical Properties of Rameauite
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
Optical Data:
Biaxial (?), b=1.95, g=1.97, , 2V(Meas)=32.
Calculated Properties of Rameauite
Electron Density:
Bulk Density (Electron Density)=4.75 gm/cc
note: Specific Gravity of Rameauite =5.60 gm/cc.
Fermion Index:
Fermion Index = 0.0052114308
Boson Index = 0.9947885692
Photoelectric:
PERameauite =1,884.57 barns/electron
U=PERameauite x relectron=8,948.23 barns/cc.
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
| SpecimenSizeWeight/Volume(Sphere) * | CalculatedActivityBecquerels(Bq) | CalculatedActivityCuries (Ci) | EstimatedActivityGR(api) | EstimatedExposure(mRem**)/hrIf Held in HandFor 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
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
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
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
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: