Studtite Mineral Data

Studtite Mineral Data +

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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.

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

Diaphaniety:

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:

r_electron=3.27 gm/cc
note: r_Studtite=3.73 gm/cc.

Fermion Index

Fermion Index = 0.00474
Boson Index = 0.99526

Photoelectric:

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

Radioactivity:

GRapi = 4,755,437.12 (Gamma Ray American Petroleum Institute Units)

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 Bequerols (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	113,896,232	3.08E-03	4,755,437.12	1,563.43
100 gm / 3.71 cm	11,389,623	3.08E-04	475,543.71	156.34
10 gm / 1.72 cm	1,138,962	3.08E-05	47,554.37	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:

5.3.1.1 (5)Oxides Containing Uranium and Thorium

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

(5.3.1)Dana Group

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

5.3.1.2 Metastudtite UO4·2(H2O) I mmm 2/m 2/m 2/m

Strunz Class:

IV/H.01-20 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 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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

Studtite

[(UO2)O2(H2O)2](H2O)2
Dana No: 5.3.1.1 Strunz No: IV/H.01-20
Locality:

Notes: