General Uranophane Information
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Chemical Formula: |
Ca(UO2)2SiO3(OH)2·5(H2O) |
Composition: |
Molecular Weight = 586.36 gm |
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Calcium 6.84 % Ca 9.56 % CaO |
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Uranium 40.59 % U 46.05 % UO2 |
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Silicon 9.58 % Si 20.49 % SiO2 |
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Hydrogen 2.06 % H 18.43 % H2O |
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Oxygen 40.93 % O |
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______ ______ |
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100.00 % 94.54 % = TOTAL OXIDE |
Empirical Formula: |
CaH2(SiO4)2(UO2)·5(H2O) |
Environment: |
Alteration product of gummite. |
IMA Status: |
Valid Species (Pre-IMA) 1853 |
Locality: |
Oberpfalz, Bavaria. Link to MinDat.org Location Data. |
Name Origin: |
From uran and phanos - "to appear." |
Synonym: |
ICSD 63029 |
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PDF 39-1360 |
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Uranotile |
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Uranophane Image |
Images:
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Uranophane
Comments: Bright yellow crystals of uranophane with black uraninite.
Location: Teofilo Otoni, Minas Gerais, Brazil.
Scale: Picture size 3.5 mm.
© Paul M. Schumacher |
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Images:
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Uranophane Uraninite
Comments: Sharp, cubic crystals of black uraninite on yellow uranophane.
Location: Teofilo Otoni, Minas Gerais, Brazil.
Scale: Picture size 1.5 mm.
© Paul M. Schumacher |
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Images:
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Uranophane Crystallography
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Axial Ratios: |
a:b:c =2.251:1:0.9446 |
Cell Dimensions: |
a = 15.87, b = 7.05, c = 6.66, Z = 3; beta = 97.25° V = 739.19 Den(Calc)= 3.95 |
Crystal System: |
Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21 |
X Ray Diffraction: |
By Intensity(I/Io): 7.88(1), 3.94(0.9), 2.99(0.8), |
Crystal Structure:
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Smith D K , Gruner J W , Lipscomb W N , American Mineralogist , 42 (1957) p.594-618, The crystal structure of uranophane [Ca(H3O)2](UO2)2(SiO4)2.3H2O
View Additional jPOWD Structure files for Uranophane
[1]
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Physical Properties of Uranophane
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Cleavage: |
[100] Perfect |
Color: |
Yellow, Yellow brown, Yellow green, Yellow orange, Light yellow. |
Density: |
3.9 |
Diaphaniety: |
Translucent to subtranslucent |
Fracture: |
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. |
Habit: |
Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite). |
Habit: |
Massive - Fibrous - Distinctly fibrous fine-grained forms. |
Habit: |
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite) |
Hardness: |
2.5 - Finger Nail |
Luminescence: |
None. |
Luster: |
Vitreous (Glassy) |
Streak: |
yellowish white |
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Optical Properties of Uranophane
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Gladstone-Dale: |
CI meas= 0.014 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1669,KPDmeas= 0.1691,KC= 0.1714 |
Optical Data: |
Biaxial (-), a=1.643, b=1.666, g=1.669, bire=0.0260, 2V(Calc)=38, 2V(Meas)=32-45. Dispersion relatively strong. |
Pleochroism (x): |
none. |
Pleochroism (y): |
none. |
Pleochroism (z): |
none. |
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Calculated Properties of Uranophane
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Electron Density: |
relectron=3.62 gm/cc note: rUranophane =3.90 gm/cc. |
Fermion Index |
Fermion Index = 0.00768 Boson Index = 0.99232 |
Photoelectric: |
PEUranophane = 994.08 barns/electron U=PEUranophane x relectron=3,596.79 barns/cc. |
Radioactivity: |
GRapi = 3,210,163.86 (Gamma Ray American Petroleum Institute Units)
Uranophane 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)
9.48 ± 2.37 grams of pure Uranophane .
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 100 cm box)
947.51 ±236.88 grams of pure Uranophane .
Estimated Radioactivity from Uranophane - 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 / 7.88 cm |
72,663,314 |
1.96E-03 |
3,210,163.86 |
1,055.40 |
| 100 gm / 3.66 cm |
7,266,331 |
1.96E-04 |
321,016.39 |
105.54 |
| 10 gm / 1.70 cm |
726,633 |
1.96E-05 |
32,101.64 |
10.55 |
| 1 gm / 7.88 mm |
72,663 |
1.96E-06 |
3,210.16 |
1.06 |
| 0.1 gm / 3.66 mm |
7,266 |
1.96E-07 |
321.02 |
0.11 |
| 0.01 gm / 1.70 mm |
727 |
1.96E-08 |
32.10 |
0.01 |
| 0.001 gm / 0.79 mm |
73 |
1.96E-09 |
3.21 |
0.00 |
Weight of pure Uranophane in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.90 gm/cc.*
Goverment Estimate of Average Annual Exposure (
360 mRem)
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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
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Uranophane Classification
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Dana Class: |
53.3.1.2 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations |
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(53.3)with (UO2) |
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(53.3.1)Uranophane group |
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53.3.1.1 Kasolite Pb(UO2)SiO4·(H2O) P 21/a 2/m |
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53.3.1.2 Uranophane Ca(UO2)2SiO3(OH)2·5(H2O) P 21 2 |
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53.3.1.3 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2·4(H2O) C 2/m 2/m |
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53.3.1.4 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2·6(H2O) P1 1 |
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53.3.1.5 Boltwoodite HK(UO2)(SiO4)·1.5(H2O) P 21 2 |
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53.3.1.6 Sodium-boltwoodite (H3O)(Na,K)(UO2)SiO4·(H2O) P 212121 2 2 2 |
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53.3.1.7 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2·3(H2O) Aba2,Abam Ortho |
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53.3.1.8 Swamboite UH6(UO2)6(SiO4)6·30(H2O) P 21/a 2/m |
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53.3.1.9 Uranophane-beta Ca[(UO2)SiO3(OH)]2·(H2O) P 21/a 2/m |
Strunz Class: |
VIII/B.34-40 VIII - Silicates |
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VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4- |
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VIII/B.34 - Sklodowskite - Uranophane - Kasolite series |
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VIII/B.34-10 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2·4(H2O) C 2/m 2/m |
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VIII/B.34-20 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2·6(H2O) P1 1 |
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VIII/B.34-30 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2·3(H2O) Aba2,Abam Ortho |
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VIII/B.34-40 Uranophane Ca(UO2)2SiO3(OH)2·5(H2O) P 21 2 |
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VIII/B.34-50 Uranophane-beta Ca[(UO2)SiO3(OH)]2·(H2O) P 21/a 2/m |
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VIII/B.34-60 Boltwoodite HK(UO2)(SiO4)·1.5(H2O) P 21 2 |
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VIII/B.34-70 Sodium-boltwoodite (H3O)(Na,K)(UO2)SiO4·(H2O) P 212121 2 2 2 |
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VIII/B.34-80 Kasolite Pb(UO2)SiO4·(H2O) P 21/a 2/m |
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Other Uranophane Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |
See Also: |
Links to other databases for Uranophane :
1 -Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Applied Mineralogy
4 -Athena
5 - Crocoite.com Mineral Locations
6 - EUROmin Project
7 - Franklin Minerals(Dunn)
8 -Google Images
9 -Google Scholar
10 -Handbook of Mineralogy (MinSocAm)
11 -Handbook of Mineralogy (UofA)
12 -MinDAT
13 -MinMax(Deutsch)
14 -MinMax(English)
15 -Mineralienatlas (Deutsch)
16 - Minerals of Wisconsin
17 -QUT Mineral Atlas
18 - Uranium Minerals
19 - Uranium Minerals
20 - WWW-MINCRYST
21 -theimage
22 -École des Mines de Paris
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Uranophane
Ca(UO2)2SiO3(OH)2·5(H2O)
Dana No: 53.3.1.2 Strunz No: VIII/B.34-40
Locality:
Notes:
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