Mineralogy Database

Compreignacite Mineral Data

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General Compreignacite Information

Help on Chemical  Formula: Chemical Formula: K2(UO2)6O4(OH)6•8(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K2(UO2)6O4(OH)6•8(H2O)
Help on Environment: Environment: Oxidation product of "pitchblende" in uranium deposits.
Help on IMA Status: IMA Status: Approved IMA 1964
Help on Locality: Locality: Margnac mine, Compreignac, Haute-Vienne, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 86630
  PDF 33-1049
 

Compreignacite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.5897:1:1.2257
Help on Cell Dimensions: Cell Dimensions: a = 7.16, b = 12.14, c = 14.88, Z = 2; V = 1,293.41 Den(Calc)= 5.16
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnmn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 7.4(1), 3.19(0.8), 3.53(0.8),
 

Physical Properties of Compreignacite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Golden yellow, Light yellow.
Help on Density: Density: 5.03
 

Optical Properties of Compreignacite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), b=1.798, g=1.802, , 2V(Meas)=10-15.
 

Calculated Properties of Compreignacite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.38 gm/cc
note: Specific Gravity of Compreignacite =5.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052406322
Boson Index = 0.9947593678
Help on Photoelectric: Photoelectric: PECompreignacite =1,901.98 barns/electron
U=PECompreignacite x relectron=8,326.23 barns/cc.
Help on Radioactivity: 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
Bequerols
(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

Help on  Dana Class: 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
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 Compreignacite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

 
   
 


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