Compreignacite Mineral Data

General Compreignacite Information

Chemical Formula:

K2(UO2)6O4(OH)6•8(H2O)

Composition:

Molecular Weight = 2,008.53 gm

Potassium 3.89 % K 4.69 % K₂O

Uranium 71.11 % U 80.66 % UO₂

Hydrogen 1.10 % H 9.87 % H₂O

Oxygen 23.90 % O

______ ______

100.00 % 95.22 % = TOTAL OXIDE

Empirical Formula:

K₂(UO₂)₆O₄(OH)₆•8(H₂O)

Environment:

Oxidation product of "pitchblende" in uranium deposits.

IMA Status:

Approved IMA 1964

Locality:

Margnac mine, Compreignac, Haute-Vienne, France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 86630

PDF 33-1049

Compreignacite Image

Images:

Compreignacite

Comments: Yellow crystals of compreignacite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Compreignacite Crystallography

Axial Ratios:

a:b:c =0.5897:1:1.2257

Cell Dimensions:

a = 7.16, b = 12.14, c = 14.88, Z = 2; V = 1,293.41 Den(Calc)= 5.16

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnmn

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

By Intensity(I/I_o): 7.4(1), 3.19(0.8), 3.53(0.8),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Burns P C , The Canadian Mineralogist , 36 (1998) p.1061-1067, The structure of compreignacite, K2((UO2)3O2(OH)3)2(H2O)7

Physical Properties of Compreignacite

Cleavage:

{001} Perfect

Color:

Golden yellow, Light yellow.

Density:

5.03

Optical Properties of Compreignacite

Gladstone-Dale:

CI meas= -0.289 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.256 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.155,KPDmeas= 0.159,KC= 0.1234
Ncalc = 1.62 - 1.64

Optical Data:

Biaxial (-), b=1.798, g=1.802, , 2V(Meas)=10-15.

Calculated Properties of Compreignacite

Electron Density:

Bulk Density (Electron Density)=4.38 gm/cc
note: Specific Gravity of Compreignacite =5.16 gm/cc.

Fermion Index:

Fermion Index = 0.0052406322
Boson Index = 0.9947593678

Photoelectric:

PE_{Compreignacite}=1,901.98 barns/electron
U=PE_{Compreignacite} x r_electron=8,326.23 barns/cc.

Radioactivity:

GRapi = 5,142,011.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Compreignacite per GRapi unit = 194.48 (PPB)

Compreignacite 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) 5.92 ± 1.48 grams of pure Compreignacite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 591.53 ±147.88 grams of pure Compreignacite .

**Estimated Radioactivity from Compreignacite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.18 cm	127,280,066	3.44E-03	5,142,011.96	1,690.52
100 gm / 3.33 cm	12,728,007	3.44E-04	514,201.20	169.05
10 gm / 1.55 cm	1,272,801	3.44E-05	51,420.12	16.91
1 gm / 7.18 mm	127,280	3.44E-06	5,142.01	1.69
0.1 gm / 3.33 mm	12,728	3.44E-07	514.20	0.17
0.01 gm / 1.55 mm	1,273	3.44E-08	51.42	0.02
0.001 gm / 0.72 mm	127	3.44E-09	5.14	0.00

Weight of pure Compreignacite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.16 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

Compreignacite Classification

Dana Class:

05.07.01.01 (05)Oxides Containing Uranium and Thorium

(05.07)with alkaline or hydrated hydroxide components

(05.07.01)Becquerelite Group

05.07.01.01 Compreignacite K2(UO2)6O4(OH)6•8(H2O) Pnmn 2/m 2/m 2/m

05.07.01.02 Becquerelite Ca(UO2)6O4(OH)6•8(H2O) Pn21a mm2

05.07.01.03 Billietite Ba(UO2)6O4(OH)6•8(H2O) Pbn21 mm2

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 Compreignacite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Compreignacite :
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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Print or Cut-and-Paste your Compreignacite Specimen Label here :

Compreignacite

K2(UO2)6O4(OH)6•8(H2O)
Dana No: 05.07.01.01 Strunz No: 04.GB.05
Locality:

Notes: