General Schoepite Information
|
Chemical Formula: |
(UO2)8O2(OH)12·12(H2O) |
Composition: |
Molecular Weight = 2,612.49 gm |
| |
Uranium 72.89 % U 82.69 % UO2 |
| |
Hydrogen 1.39 % H 12.41 % H2O |
| |
Oxygen 25.72 % O |
| |
______ ______ |
| |
100.00 % 95.10 % = TOTAL OXIDE |
Empirical Formula: |
(UO2)8O2(OH)12·12(H2O) |
Environment: |
Found as an alteration product of uraninite, alters spontanously to metaschoepite and paraschoepite. |
IMA Status: |
Valid Species (Pre-IMA) 1923 |
Locality: |
Kasolo, Shaba, Zaire. Link to MinDat.org Location Data. |
Name Origin: |
Named for Alfred Schoep (1881-1966), Belgian mineralogist who studied uranium mineralogy. |
Synonym: |
ICSD 82477 |
| |
PDF 13-407 |
| |
Schoepite Image |
Images:
|
|
Images:
|
|
Schoepite Metatorbernite
Comments: Green, tabular crystals of metatorbernite and acicular, yellow schoepite on matrix.
Location: Musonoi mine, Kolwezi, Shaba, (Katanga), Congo (Za?re).
Scale: Picture size 2.5 mm.
© Paul M. Schumacher |
|
Images:
|
|
Schoepite Crystallography
|
Axial Ratios: |
a:b:c =0.8534:1:0.8773 |
Cell Dimensions: |
a = 14.33, b = 16.79, c = 14.73, Z = 4; V = 3,544.05 Den(Calc)= 4.90 |
Crystal System: |
Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P 21ca |
X Ray Diffraction: |
By Intensity(I/Io): 7.28(1), 5.08(0.7), 3.44(0.25), |
Forms:
Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above
|
|
|
Forms:
[ 2 1 1]
[ 0 2 1]
[ 0 1 0]
[ 0 1 1]
[ 1 0 2]
[ 1 1 1]
[ 0 3 1]
[ 2 1 0]
[ 1 0 0]
[ 0 0 1]
Warning: this large pop-up is very compute intensive and
may not work well with some computers.
|
|
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
|
|
|
Finch R J , Cooper M A , Hawthorne F C , Ewing R C , The Canadian Mineralogist , 34 (1996) p.1071-1088, The crystal structure of schoepite, [(UO2)8O2(OH)12](H2O)12
|
|
| |
Physical Properties of Schoepite
|
Cleavage: |
[001] Perfect, [010] Indistinct |
Color: |
Yellow, Lemon yellow, Brownish yellow, Amber. |
Density: |
4.8 |
Diaphaniety: |
Transparent to Translucent |
Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
Hardness: |
2.5 - Finger Nail |
Luminescence: |
Fluorescent. |
Luster: |
Adamantine |
Streak: |
light yellow |
| |
Optical Properties of Schoepite
|
Gladstone-Dale: |
CI meas= -0.189 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.165 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1455,KPDmeas= 0.1485,KC= 0.1249 |
Optical Data: |
Biaxial (-), a=1.69, b=1.714, g=1.735, bire=0.0450 |
Pleochroism (x): |
colorless. |
Pleochroism (y): |
colorless. |
Pleochroism (z): |
colorless. |
| |
Calculated Properties of Schoepite
|
Electron Density: |
relectron=4.16 gm/cc note: rSchoepite =4.90 gm/cc. |
Fermion Index |
Fermion Index = 0.00537 Boson Index = 0.99463 |
Photoelectric: |
PESchoepite =1,949.60 barns/electron U=PESchoepite x relectron=8,103.18 barns/cc. |
Radioactivity: |
GRapi = 5,270,031.36 (Gamma Ray American Petroleum Institute Units)
Schoepite 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)
5.77 ± 1.44 grams of pure Schoepite .
Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 100 cm box)
577.16 ±144.29 grams of pure Schoepite .
Estimated Radioactivity from Schoepite - 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 / 7.30 cm |
130,472,133 |
3.53E-03 |
5,270,031.36 |
1,732.61 |
| 100 gm / 3.39 cm |
13,047,213 |
3.53E-04 |
527,003.14 |
173.26 |
| 10 gm / 1.57 cm |
1,304,721 |
3.53E-05 |
52,700.31 |
17.33 |
| 1 gm / 7.30 mm |
130,472 |
3.53E-06 |
5,270.03 |
1.73 |
| 0.1 gm / 3.39 mm |
13,047 |
3.53E-07 |
527.00 |
0.17 |
| 0.01 gm / 1.57 mm |
1,305 |
3.53E-08 |
52.70 |
0.02 |
| 0.001 gm / 0.73 mm |
130 |
3.53E-09 |
5.27 |
0.00 |
Weight of pure Schoepite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.90 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
|
| |
Schoepite Classification
|
Dana Class: |
5.2.1.3 (5)Oxides Containing Uranium and Thorium |
| |
(5.2)with a cation charge of 6+ (AO3) and hydrated |
| |
(5.2.1)Dana Group |
| |
5.2.1.1 Metaschoepite UO3·n(H2O)(n<2) Pbna 2/m 2/m 2/m |
| |
5.2.1.2 Paraschoepite UO3·2(H2O)(?) P bca 2/m 2/m 2/m |
| |
5.2.1.3 Schoepite (UO2)8O2(OH)12·12(H2O) P 21ca mm2 |
Strunz Class: |
IV/H.01-40 IV - Oxides |
| |
IV/H - Uranyl ([UO2]2+) hydroxides and hydrates |
| |
IV/H.01 - Ianthinite - Paraschoepite series |
| |
IV/H.01-10 Ianthinite (UO2)·5(UO3)·10(H2O) P 21cn mm2 |
| |
IV/H.01-20 Studtite [(UO2)O2(H2O)2](H2O)2 C 2/m 2/m |
| |
IV/H.01-30 Metastudtite UO4·2(H2O) I mmm 2/m 2/m 2/m |
| |
IV/H.01-40 Schoepite (UO2)8O2(OH)12·12(H2O) P 21ca mm2 |
| |
IV/H.01-50 Metaschoepite UO3·n(H2O)(n<2) Pbna 2/m 2/m 2/m |
| |
IV/H.01-60 Paraschoepite UO3·2(H2O)(?) P bca 2/m 2/m 2/m |
| |
Other Schoepite Information
|
References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Schoepite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - Crocoite.com Mineral Locations
4 - EUROmin Project
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - Uranium Minerals
14 - WWW-MINCRYST
15 -École des Mines de Paris
Search for Schoepite using:
[ALTAVISTA]
[AOL]
[About.com]
[All-The-Web]
[HotBot]
[Ixquick]
[LookSmart]
[MAMMA]
[MSN.COM]
[Netscape]
[Teoma]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Schoepite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop
Translate Schoepite Mineral Data :
Ask about Schoepite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
Print or Cut-and-Paste your Schoepite Specimen Label here :
|
Schoepite
(UO2)8O2(OH)12·12(H2O)
Dana No: 5.2.1.3 Strunz No: IV/H.01-40
Locality:
Notes:
|
|
| |
| |
|
| |