Uranosilite Mineral Data

Uranosilite Mineral Data +

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General Uranosilite Information

Chemical Formula:

(U++++++O2)Si7O15

Composition:

Molecular Weight = 706.62 gm

Uranium 33.69 % U 38.21 % UO₂

Silicon 27.82 % Si 59.52 % SiO₂

Oxygen 38.49 % O

______ ______

100.00 % 97.74 % = TOTAL OXIDE

Empirical Formula:

(UO₂)Si₇O₁₅

IMA Status:

Approved IMA 1983

Locality:

Menzeschwand, Schwarzwald, Germany. Link to MinDat.org Location Data.

Name Origin:

Named in allusion to the composition.

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Uranosilite Crystallography

Axial Ratios:

a:b:c =0.7901:1:0.8739

Cell Dimensions:

a = 11.6, b = 14.68, c = 12.83, Z = 6; V = 2,184.80 Den(Calc)= 3.22

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 22121

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

By Intensity(I/I_o): 7.3(1), 6.19(0.9), 11.58(0.9),

Physical Properties of Uranosilite

Cleavage:

None

Color:

Yellowish white.

Density:

3.25

Habit:

Acicular - Occurs as needle-like crystals.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Uranosilite

Gladstone-Dale:

CI meas= -0.096 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.106 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1792,KPDmeas= 0.1775,KC= 0.162

Optical Data:

Biaxial (-), a=1.57, g=1.584, bire=0.0140

Calculated Properties of Uranosilite

Electron Density:

r_electron=3.00 gm/cc
note: r_Uranosilite=3.25 gm/cc.

Fermion Index

Fermion Index = 0.0156
Boson Index = 0.9844

Photoelectric:

PE_Uranosilite= 829.41 barns/electron
U=PE_Uranosilite x r_electron=2,487.24 barns/cc.

Radioactivity:

GRapi = 2,649,369.49 (Gamma Ray American Petroleum Institute Units)

Uranosilite 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) 11.48 ± 2.87 grams of pure Uranosilite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1148.1 ±287.02 grams of pure Uranosilite .

**Estimated Radioactivity from Uranosilite** - 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 / 8.38 cm	60,297,385	1.63E-03	2,649,369.49	871.03
100 gm / 3.89 cm	6,029,739	1.63E-04	264,936.95	87.10
10 gm / 1.80 cm	602,974	1.63E-05	26,493.69	8.71
1 gm / 8.38 mm	60,297	1.63E-06	2,649.37	0.87
0.1 gm / 3.89 mm	6,030	1.63E-07	264.94	0.09
0.01 gm / 1.80 mm	603	1.63E-08	26.49	0.01
0.001 gm / 0.84 mm	60	1.63E-09	2.65	0.00

Weight of pure Uranosilite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.25 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

Uranosilite Classification

Dana Class:

53.3.3.2 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations

(53.3)with (UO2)

(53.3.3)Other uranyl sillicates

53.3.3.1 Soddyite (UO2)2SiO4·2(H2O) F ddd 2/m 2/m 2/m

53.3.3.2 Uranosilite (UO2)Si7O15 P 22121 2 2 2

Strunz Class:

VIII/B.35-10 VIII - Silicates

VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-

VIII/B.35 - Uranosilite series

VIII/B.35-10 Uranosilite (UO2)Si7O15 P 22121 2 2 2

Other Uranosilite Information

References:

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

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Uranosilite

(U++++++O2)Si7O15
Dana No: 53.3.3.2 Strunz No: VIII/B.35-10
Locality:

Notes: