Compreignacite Mineral Data

Compreignacite Mineral Data

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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)

IMA Status:

Approved IMA 1964

Locality:

Link to MinDat.org Location Data.

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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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

Optical Data:

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

Calculated Properties of Compreignacite

Electron Density:

r_electron=4.38 gm/cc
note: r_{Compreignacite}=5.16 gm/cc.

Fermion Index

Fermion Index = 0.00524
Boson Index = 0.99476

Photoelectric:

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

Radioactivity:

GRapi = 5,142,010.12 (Gamma Ray American Petroleum Institute Units)

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	127,280,060	3.44E-03	5,142,010.12	1,690.52
100 gm / 3.33 cm	12,728,006	3.44E-04	514,201.01	169.05
10 gm / 1.55 cm	1,272,801	3.44E-05	51,420.10	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:

5.7.1.1 (5)Oxides Containing Uranium and Thorium

(5.7)with alkaline or hydrated hydroxide components

(5.7.1)Dana Group

5.7.1.1 Compreignacite K2(UO2)6O4(OH)6·8(H2O) Pnmn 2/m 2/m 2/m

5.7.1.2 Becquerelite Ca(UO2)6O4(OH)6·8(H2O) Pn21a mm2

5.7.1.3 Billietite Ba(UO2)6O4(OH)6·8(H2O) Pbn21 mm2

Strunz Class:

IV/H.03-10 IV - Oxides

IV/H - Uranyl ([UO2]2+) hydroxides and hydrates

IV/H.03 - Comperignacite - Billietite series

IV/H.03-10 Compreignacite K2(UO2)6O4(OH)6·8(H2O) Pnmn 2/m 2/m 2/m

IV/H.03-20 Becquerelite Ca(UO2)6O4(OH)6·8(H2O) Pn21a mm2

IV/H.03-30 Protasite Ba(UO2)3O3(OH)2·3(H2O) Pn m

IV/H.03-40 Billietite Ba(UO2)6O4(OH)6·8(H2O) Pbn21 mm2

Other Compreignacite Information

References:

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 -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 - WWW-MINCRYST 14 -École des Mines de Paris

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Compreignacite

K2(UO2)6O4(OH)6·8(H2O)
Dana No: 5.7.1.1 Strunz No: IV/H.03-10
Locality:

Notes: