Orthobrannerite Mineral Data

Orthobrannerite Mineral Data +

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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

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

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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 - DisphenoidalH-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

Optical Data:

Isotropic, n=2.328.

Calculated Properties of Orthobrannerite

Electron Density:

r_electron=4.71 gm/cc
note: r_{Orthobrannerite}=5.45 gm/cc.

Fermion Index

Fermion Index = 0.03166
Boson Index = 0.96834

Photoelectric:

PE_{Orthobrannerite}=1,402.97 barns/electron
U=PE_{Orthobrannerite} x r_electron=6,605.82 barns/cc.

Radioactivity:

GRapi = 3,923,182.74 (Gamma Ray American Petroleum Institute Units)

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	95,362,286	2.58E-03	3,923,182.74	1,289.81
100 gm / 3.27 cm	9,536,229	2.58E-04	392,318.27	128.98
10 gm / 1.52 cm	953,623	2.58E-05	39,231.83	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 / 0.71 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 5.45 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:

8.2.7.1 (8)Multiple Oxides with Nb, Ta, and Ti

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

(8.2.7)Dana Group

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

Strunz Class:

IV/D.22-30 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.22 - Thorutite - Orthobrannerite series

IV/D.22-10 Thorutite (Th,U,Ca)Ti2(O,OH)6 C 2/m 2/m

IV/D.22-20 Brannerite (U,Ca,Ce)(Ti,Fe)2O6 C 2/m 2/m

IV/D.22-30 Orthobrannerite UUTi4O12(OH)2 P 2₁22 2 2 2

Other Orthobrannerite 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 Orthobrannerite :
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 -École des Mines de Paris

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Orthobrannerite

U++++U++++++Ti4O12(OH)2
Dana No: 8.2.7.1 Strunz No: IV/D.22-30
Locality:

Notes: