Mineralogy Database

Metastudtite Mineral Data

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General Metastudtite Information

Help on Chemical  Formula: Chemical Formula: UO4•2(H2O)
Help on Composition: Composition: Molecular Weight = 338.06 gm
   Uranium   70.41 %  U    84.61 % UO3
   Hydrogen   1.19 %  H    10.66 % H2O
   Oxygen    28.40 %  O
            ______        ______ 
            100.00 %       95.27 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: UO4•2(H2O)
Help on Environment: Environment: Secondary uranium mineral containing peroxide formed by the alpha-radiolysis of water during formation. May also form in spent-fission fuel elements.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the lower hydration product of studtite.
Help on Name Pronunciation: Name Pronunciation: Metastudtite + Pronunciation Say METASTUDTITE

Metastudtite Image

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Comments: White acicular microcrystal metastudtite clusters on dark yellow to brown sklodowskite grains.
Location: Musonoi, Katanga, Shaba, Zaire. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Metastudtite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7414:1:0.4794
Help on Cell Dimensions: Cell Dimensions: a = 6.51, b = 8.78, c = 4.21, Z = 2; V = 240.63 Den(Calc)= 4.67
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: I mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.22(1), 3.54(0.8), 4.38(0.5),

Physical Properties of Metastudtite

Help on Color: Color: Light yellow.
Help on Density: Density: 4.67
Help on Luster: Luster: Silky
Help on Streak: Streak: light yellow

Optical Properties of Metastudtite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.08 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1469,KPDmeas= 0.1469,KC= 0.1361
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.64, b=1.658, g=1.76, bire=0.1200, 2V(Calc)=48, 2V(Meas)=47.7.

Calculated Properties of Metastudtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.98 gm/cc
note: Specific Gravity of Metastudtite =4.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0052076745
Boson Index = 0.9947923255
Help on Photoelectric: Photoelectric: PEMetastudtite =1,875.15 barns/electron
U=PEMetastudtite x relectron=7,460.28 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 5,113,001.17 (Gamma Ray American Petroleum Institute Units)
Concentration of Metastudtite per GRapi unit = 195.58 (PPB)

Metastudtite 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) 5.95 ± 1.49 grams of pure Metastudtite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 594.89 ±148.72 grams of pure Metastudtite .

Estimated Radioactivity from Metastudtite - very strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.42 cm 126,035,448 3.41E-03 5,113,001.17 1,680.99
100 gm / 3.45 cm 12,603,545 3.41E-04 511,300.12 168.10
10 gm / 1.60 cm 1,260,354 3.41E-05 51,130.01 16.81
1 gm / 7.42 mm 126,035 3.41E-06 5,113.00 1.68
0.1 gm / 3.45 mm 12,604 3.41E-07 511.30 0.17
0.01 gm / 1.60 mm 1,260 3.41E-08 51.13 0.02
0.001 gm / 0.74 mm 126 3.41E-09 5.11 0.00

Weight of pure Metastudtite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.67 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

Metastudtite Classification

Help on  Dana Class: Dana Class: (05)Oxides Containing Uranium and Thorium
  (05.03)with a cation charge of 8+ (AO4) and hydrated
  (05.03.01)Studtite Group Studtite [(UO2)O2(H2O)2](H2O)2 C 2/m 2/m Metastudtite UO4•2(H2O) I mmm 2/m 2/m 2/m
Help on  Strunz Class: 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 Metastudtite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Metastudtite :
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

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Dana No: Strunz No: 04.GA.15





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