Rameauite Mineral Data

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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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Rameauite=1,884.57 barns/electron
U=PE_Rameauite x r_electron=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
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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Rameauite

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

Notes: