Studtite Mineral Data

General Studtite Information

Chemical Formula:

[(UO2)O2(H2O)2](H2O)2

Composition:

Molecular Weight = 374.09 gm

Uranium 63.63 % U

Hydrogen 2.16 % H

Oxygen 34.22 % O

______

100.00 %

Empirical Formula:

(UO₂)O₂•4(H₂O)

Environment:

Secondary uranium mineral containing peroxide formed by the alpha-radiolysis of water during formation. May also form in spent-fission fuel elements.

IMA Status:

Valid Species (Pre-IMA) 1947

Locality:

Zaire at Shinkolobwe, Shaba. Link to MinDat.org Location Data.

Name Origin:

Named for Franz Edward Studt, Belgian prospector and geologist, author of the first geological map (1913) of Shava, Zaire.

Name Pronunciation:

Studtite

Studtite Image

Images:

Studtite Billietite

Comments: Acicular, white sprays of studtite crystals on yellow, tabular billietite.
Location: Shinkolobwe mine, Tantara, Shaba, Democratic Republic of the Congo. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Studtite Crystallography

Axial Ratios:

a:b:c =2.0931:1:1.2539

Cell Dimensions:

a = 14.068, b = 6.721, c = 8.428, Z = 4; beta = 123.356° V = 665.61 Den(Calc)= 3.73

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 5.92(1), 3.4(0.8), 2.96(0.6),

Crystal Structure:

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Burns P C , Hughes K-A , American Mineralogist , 88 (2003) p.1165-1168, Studtite, [(UO2)(O2)(H2O)2](H2O)2: The first structure of a peroxide mineral

Physical Properties of Studtite

Cleavage:

None

Color:

Yellow, White yellow.

Density:

3.64

Diaphaneity:

Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

1-2 - Between Talc and Gypsum

Luminescence:

Non-fluorescent.

Streak:

light yellow

Optical Properties of Studtite

Optical Data:

Biaxial (+), a=1.545, b=1.555, g=1.68, bire=0.1350

Calculated Properties of Studtite

Electron Density:

Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Studtite =3.73 gm/cc.

Fermion Index:

Fermion Index = 0.004748768
Boson Index = 0.995251232

Photoelectric:

PE_Studtite=1,646.52 barns/electron
U=PE_Studtite x r_electron=5,384.87 barns/cc.

Radioactivity:

GRapi = 4,755,438.79 (Gamma Ray American Petroleum Institute Units)
Concentration of Studtite per GRapi unit = 210.29 (PPB)

Studtite 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) 6.40 ± 1.60 grams of pure Studtite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 639.62 ±159.90 grams of pure Studtite .

**Estimated Radioactivity from Studtite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 8.00 cm	113,896,239	3.08E-03	4,755,438.79	1,563.43
100 gm / 3.71 cm	11,389,624	3.08E-04	475,543.88	156.34
10 gm / 1.72 cm	1,138,962	3.08E-05	47,554.39	15.63
1 gm / 8.00 mm	113,896	3.08E-06	4,755.44	1.56
0.1 gm / 3.71 mm	11,390	3.08E-07	475.54	0.16
0.01 gm / 1.72 mm	1,139	3.08E-08	47.55	0.02
0.001 gm / 0.80 mm	114	3.08E-09	4.76	0.00

Weight of pure Studtite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.73 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

Studtite Classification

Dana Class:

05.03.01.01 (05)Oxides Containing Uranium and Thorium

(05.03)with a cation charge of 8+ (AO4) and hydrated

(05.03.01)Studtite Group

05.03.01.01 Studtite [(UO2)O2(H2O)2](H2O)2 C 2/m 2/m

05.03.01.02 Metastudtite UO4•2(H2O) I mmm 2/m 2/m 2/m

Strunz Class:

04.GA.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.G - Uranyl Hydroxides

04.GA -Without additional cations

04.GA.15 Metastudtite UO4•2(H2O) I mmm 2/m 2/m 2/m

04.GA.15 Studtite [(UO2)O2(H2O)2](H2O)2 C 2/m 2/m

Other Studtite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8, AmMin, v 88, p 1165) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Studtite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Print or Cut-and-Paste your Studtite Specimen Label here :

Studtite

[(UO2)O2(H2O)2](H2O)2
Dana No: 05.03.01.01 Strunz No: 04.GA.15
Locality:

Notes: