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Southern parts of the Canadian Precambrian Shield, Bancroft, Ontario. New Hampshire, USA. Transvaal gold-bearing conglomerates. Link to MinDat.org Location Data.

Name Origin:

From its elemental composition containing uranium.

Name Pronunciation:

Uraninite + Pronunciation

Synonym:

Broggerite - Th bearing

Gummite

ICSD 29085

PDF 41-1422

Uraninite Image

Images:

Uraninite Uranophane

Images:

Uraninite

Images:

Uraninite

Uraninite Crystallography

Cell Dimensions:

a = 5.4682, Z = 4; V = 163.51 Den(Calc)= 10.97

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m3 2/m) Space Group: F m3m

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

By Intensity(I/I_o):3.157(1), 1.934(0.49), 2.735(0.48),

Forms:

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Forms:

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Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Fluorite structure

Physical Properties of Uraninite

Cleavage:

{???} Good

Color:

Brownish black, Gray, Grayish black, Black.

Density:

6.5 - 10.95, Average = 8.72

Diaphaneity:

Nearly opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Dendritic - Branching "tree-like" growths of great complexity (e.g. pyrolusite).

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Magnetism:

Nonmagnetic

Streak:

brownish black

Optical Properties of Uraninite

Optical Data:

NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.1) where Ncalc=Dcalc*KC+1
NCalc= 1.87 - from Gladstone-Dale relationship (KC = 0.1) where Ncalc=Dmeas*KC+1

RL Color:

Light gray with brownish tint, may show dark brwon internal reflections.

Reflectivity

Calculated Properties of Uraninite

Electron Density:

Bulk Density (Electron Density)=8.78 gm/cc
note: Specific Gravity of Uraninite =11.0 gm/cc.

Fermion Index:

Fermion Index = 0.0064036671
Boson Index = 0.9935963329

Photoelectric:

PE_Uraninite=2,500.07 barns/electron
U=PE_Uraninite x_electron=21938.34 barns/cc.

Radioactivity:

GRapi = 6,010,360.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Uraninite per GRapi unit = 166.38 (PPB)

Uraninite isRadioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

EstimatedMaximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 10 cm box)5.06 ± 1.27 grams of pure Uraninite .
EstimatedMaximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 100 cm box)506.07 ±126.52 grams of pure Uraninite .

**Estimated Radioactivity from Uraninite** - very strong
				)/hr If Held in Hand For One Hour

Uraninite Classification

Dana Class:

05.01.01.01(05)Oxides Containing Uranium and Thorium

(05.01)with a cation charge of 4+ (AO2)

(05.01.01)Dana Group

Strunz Class:

04.DL.0504 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

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

04.DL -With large (± medium-sized) cations; fluorite-type structures

Other Uraninite Information

References:

NAME( Mason68) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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