Bauranoite Mineral Data

Bauranoite Mineral Data +

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General Bauranoite Information

Chemical Formula:

BaU2O7·4-5(H2O)

Composition:

Molecular Weight = 806.45 gm

Barium 17.03 % Ba 19.01 % BaO

Uranium 59.03 % U 66.97 % UO₂

Hydrogen 1.12 % H 10.05 % H₂O

Oxygen 22.82 % O

______ ______

100.00 % 96.03 % = TOTAL OXIDE

Empirical Formula:

BaU₂O₇·4.5(H₂O)

Environment:

Secondary mineral replacing uraninite.

IMA Status:

Approved IMA 1972

Locality:

U-Mo deposit in Russia. Link to MinDat.org Location Data.

Name Origin:

Named for its composition of (Ba)(Urano)ite.

Bauranoite Image

Images:

Bauranoite

Comments: Massive, orange-brown crystalline aggregate of bauranoite.
Location: Strel'tsovskoye ore field, Krasnokamensk, Chitinskaya Oblast', Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Bauranoite Crystallography

Crystal System:

TriclinicSpace Group: Triclinic ?

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

By Intensity(I/I_o): 3.09(1), 3.41(0.7), 1.98(0.6),1.667(0.6), 1.723(0.6), 1.908(0.6), 1.948(0.6), 1.325(0.5),

Physical Properties of Bauranoite

Color:

Reddish brown.

Density:

5.28 - 5.42, Average = 5.35

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5 - Apatite

Optical Properties of Bauranoite

Gladstone-Dale:

CI meas= -0.37 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1719,KC= 0.1255

Optical Data:

Biaxial (-), a=1.911-1.916, g=1.92-1.932, bire=0.0090-0.0160, 2V(Meas)=81.

Calculated Properties of Bauranoite

Electron Density:

r_electron=4.52 gm/cc
note: r_Bauranoite=5.35 gm/cc.

Fermion Index

Fermion Index = 0.0347
Boson Index = 0.9653

Photoelectric:

PE_Bauranoite=1,664.39 barns/electron
U=PE_Bauranoite x r_electron=7,530.39 barns/cc.

Radioactivity:

GRapi = 4,255,234.15 (Gamma Ray American Petroleum Institute Units)

Bauranoite 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) 7.15 ± 1.79 grams of pure Bauranoite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 714.81 ±178.70 grams of pure Bauranoite .

**Estimated Radioactivity from Bauranoite** - 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 / 7.09 cm	105,666,081	2.86E-03	4,255,234.15	1,398.98
100 gm / 3.29 cm	10,566,608	2.86E-04	425,523.41	139.90
10 gm / 1.53 cm	1,056,661	2.86E-05	42,552.34	13.99
1 gm / 7.09 mm	105,666	2.86E-06	4,255.23	1.40
0.1 gm / 3.29 mm	10,567	2.86E-07	425.52	0.14
0.01 gm / 1.53 mm	1,057	2.86E-08	42.55	0.01
0.001 gm / 0.71 mm	106	2.86E-09	4.26	0.00

Weight of pure Bauranoite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.35 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

Bauranoite Classification

Dana Class:

5.4.2.2 (5)Oxides Containing Uranium and Thorium

(5.4)with alkaline-earth elements (hydrated)

(5.4.2)Dana Group

5.4.2.1 Calciouranoite (Ca,Ba,Pb)U2O7·5(H2O) Unk Tri

5.4.2.2 Bauranoite BaU2O7·4-5(H2O) Triclinic ? Tri

Strunz Class:

IV/H.06-30 IV - Oxides

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

IV/H.06 - Calciouranoite - Wölsendorfite series

IV/H.06-10 Calciouranoite (Ca,Ba,Pb)U2O7·5(H2O) Unk Tri

IV/H.06-20 Metacalciouranoite (Ca,Na,Ba)U2O7·2(H2O) Ortho ? Ortho

IV/H.06-30 Bauranoite BaU2O7·4-5(H2O) Triclinic ? Tri

IV/H.06-40 Wolsendorfite (Pb,Ba,Ca)U2O7·2(H2O) Unk Ortho

Other Bauranoite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Bauranoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 -École des Mines de Paris

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Bauranoite

BaU2O7·4-5(H2O)
Dana No: 5.4.2.2 Strunz No: IV/H.06-30
Locality:

Notes: