Romanite Mineral Data

Romanite Mineral Data

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General Romanite Information

Chemical Formula:

(Fe++,U,Pb)2(Ti,Fe+++)O4

Composition:

Molecular Weight = 365.14 gm

Uranium 39.11 % U 44.37 % UO₂

Titanium 9.83 % Ti 16.41 % TiO₂

Iron 22.18 % Fe 23.61 % FeO / 5.47 % Fe₂O₃

Lead 11.35 % Pb 12.23 % PbO

Oxygen 17.53 % O

______ ______

100.00 % 102.08 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_1.2U_0.6Pb_0.2Ti_0.75Fe³⁺_0.25O₄

IMA Status:

Not Submitted IMA

Locality:

Romania. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

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Romanite Crystallography

Crystal System:

TrigonalSpace Group: Trig ?

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

By Intensity(I/I_o): 1.44(0.9), 2.84(0.9), 1.69(0.85),

Physical Properties of Romanite

Color:

Gray, Black.

Density:

4.07 - 4.46, Average = 4.26

Diaphaniety:

Opaque

Fracture:

Conchoidal - Irregular - Irregular fracture producing small, conchoidal fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous - Metallic

Calculated Properties of Romanite

Electron Density:

r_electron=3.69 gm/cc
note: r_Romanite=4.27 gm/cc.

Fermion Index

Fermion Index = 0.04539
Boson Index = 0.95461

Photoelectric:

PE_Romanite=1,237.46 barns/electron
U=PE_Romanite x r_electron=4,561.68 barns/cc.

Radioactivity:

GRapi = 2,881,544.65 (Gamma Ray American Petroleum Institute Units)

Romanite 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) 10.56 ± 2.64 grams of pure Romanite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1055.6 ±263.89 grams of pure Romanite .

**Estimated Radioactivity from Romanite** - 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 / 7.65 cm	70,011,733	1.89E-03	2,881,544.65	947.36
100 gm / 3.55 cm	7,001,173	1.89E-04	288,154.46	94.74
10 gm / 1.65 cm	700,117	1.89E-05	28,815.45	9.47
1 gm / 7.65 mm	70,012	1.89E-06	2,881.54	0.95
0.1 gm / 3.55 mm	7,001	1.89E-07	288.15	0.09
0.01 gm / 1.65 mm	700	1.89E-08	28.82	0.01
0.001 gm / 0.77 mm	70	1.89E-09	2.88	0.00

Weight of pure Romanite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.27 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

Romanite Classification

Dana Class:

4.0.0.0 (4)Oxide Minerals

(4.0)Without Dana Classification Numbers

(Oxide)

Strunz Class:

IV/X.00-00 IV - Oxides

IV/X - Unclassified Strunz Oxides

IV/X.00 - Oxide

Other Romanite Information

References:

PHYS. PROP.(Am.Min.,Vol.77,p1117,1992)

See Also:

Links to other databases for Romanite :
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

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Romanite

(Fe++,U,Pb)2(Ti,Fe+++)O4
Dana No: Unknown Strunz No: IV/X.00-00
Locality:

Notes: