Orthobrannerite Mineral Data

General Orthobrannerite Information

Chemical Formula:

U++++U++++++Ti4O12(OH)2

Composition:

Molecular Weight = 893.59 gm

Uranium 53.28 % U 30.22 % UO₂ / 32.01 % UO₃

Titanium 21.43 % Ti 35.76 % TiO₂

Hydrogen 0.23 % H 2.02 % H₂O

Oxygen 25.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

UUTi₄O₁₂(OH)₂

Environment:

Weathered biotite pyroxene syenite. Dimorphous with brannerite (?).

IMA Status:

Approved IMA 1978

Locality:

Undefined localities in Yunan and Szechwan Provinces, China. Link to MinDat.org Location Data.

Name Origin:

Named as an ORTHOrhombic dimorph of brannerite.

Name Pronunciation:

Orthobrannerite + Pronunciation

Orthobrannerite Crystallography

Axial Ratios:

a:b:c =0.6315:1:0.5424

Cell Dimensions:

a = 7.37, b = 11.67, c = 6.33, Z = 2; V = 544.43 Den(Calc)= 5.45

Crystal System:

Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: P 2₁22

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

By Intensity(I/I_o): 3.17(1), 1.659(0.9), 2.45(0.9),

Physical Properties of Orthobrannerite

Cleavage:

None

Color:

Brownish green, Black.

Density:

5.46

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

5.5 - Knife Blade

Luster:

Adamantine

Streak:

brownish yellow

Optical Properties of Orthobrannerite

Gladstone-Dale:

CI meas= -0.129 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.131 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2437,KPDmeas= 0.2432,KC= 0.2154
Ncalc = 2.17 - 2.18

Optical Data:

Isotropic, n=2.328.

Calculated Properties of Orthobrannerite

Electron Density:

Bulk Density (Electron Density)=4.72 gm/cc
note: Specific Gravity of Orthobrannerite =5.46 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Orthobrannerite}=1,402.97 barns/electron
U=PE_{Orthobrannerite} x r_electron=6,617.94 barns/cc.

Radioactivity:

GRapi = 3,923,184.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Orthobrannerite per GRapi unit = 254.89 (PPB)

Orthobrannerite 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) 7.75 ± 1.94 grams of pure Orthobrannerite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 775.31 ±193.83 grams of pure Orthobrannerite .

**Estimated Radioactivity from Orthobrannerite** - 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 / 7.05 cm	95,362,298	2.58E-03	3,923,184.27	1,289.81
100 gm / 3.27 cm	9,536,230	2.58E-04	392,318.43	128.98
10 gm / 1.52 cm	953,623	2.58E-05	39,231.84	12.90
1 gm / 7.05 mm	95,362	2.58E-06	3,923.18	1.29
0.1 gm / 3.27 mm	9,536	2.58E-07	392.32	0.13
0.01 gm / 1.52 mm	954	2.58E-08	39.23	0.01
0.001 gm / 0.70 mm	95	2.58E-09	3.92	0.00

Weight of pure Orthobrannerite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.46 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

Orthobrannerite Classification

Dana Class:

08.02.07.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.02)where (A)2 (B2O6) (O,OH,F)

(08.02.07)Dana Group

08.02.07.01 Orthobrannerite UUTi4O12(OH)2 P 2₁22 2 2 2

Strunz Class:

04.DH.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DH -With large (ï¿½ medium-sized) cations; sheets of edge-sharing octahedra

04.DH.05 Brannerite (U,Ca,Ce)(Ti,Fe)2O6 C 2/m 2/m

04.DH.05 Orthobrannerite UUTi4O12(OH)2 P 2₁22 2 2 2

04.DH.05 Thorutite (Th,U,Ca)Ti2(O,OH)6 C 2/m 2/m

Other Orthobrannerite 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 Orthobrannerite :
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

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Orthobrannerite

U++++U++++++Ti4O12(OH)2
Dana No: 08.02.07.01 Strunz No: 04.DH.05
Locality:

Notes:

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