Mineralogy Database

Umohoite Mineral Data

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General Umohoite Information

Help on Chemical  Formula: Chemical Formula: [(UO2)MoO4]•H2O
Help on Composition: Composition: Molecular Weight = 447.98 gm
   Uranium     53.13 %  U    60.28 % UO2
   Molybdenum  21.42 %  Mo   32.13 % MoO3
   Hydrogen     0.45 %  H     4.02 % H2O
   Oxygen      25.00 %  O
              ______        ______ 
              100.00 %       96.43 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (UO2)(MoO4)•(H2O)
Help on Environment: Environment: Secondary U and Mo deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1953
Help on Locality: Locality: Freedom No. 2 mine, Marysvale, Piute County, Utah. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the composition of U, Mo, H.
Help on Name Pronunciation: Name Pronunciation: Umohoite Say UMOHOITE
 

Umohoite Image

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  Umohoite

Comments: Orange Umohoite aggregates on matrix.
Location: Rabéjac, Lodève, Hérault, Languedoc-Roussillon, France. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Umohoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8467:1:1.9429
Help on Cell Dimensions: Cell Dimensions: a = 6.3748, b = 7.5287, c = 14.628, Z = 4; alpha = 82.64°, beta = 85.95°, gamma = 89.91° V = 694.53 Den(Calc)= 4.28
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.13(1), 3.2(0.5), 3.15(0.4),
 

Physical Properties of Umohoite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bluish black, Dark green, Black.
Help on Density: Density: 4.55 - 4.93, Average = 4.74
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: blue gray
 

Optical Properties of Umohoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.248 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1874,KPDmeas= 0.1692,KC= 0.1501
Ncalc = 1.64 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.66, b=1.831, g=1.915, bire=0.2550, 2V(Calc)=64, 2V(Meas)=65.
Help on Pleochroism (x): Pleochroism (x): dark blue.
Help on Pleochroism (y): Pleochroism (y): light blue.
Help on Pleochroism (z): Pleochroism (z): olive green.
 

Calculated Properties of Umohoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.06 gm/cc
note: Specific Gravity of Umohoite =4.74 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEUmohoite =1,444.54 barns/electron
U=PEUmohoite x relectron=5,869.21 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,882,185.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Umohoite per GRapi unit = 257.59 (PPB)

Umohoite 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) 7.83 ± 1.96 grams of pure Umohoite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 783.49 ±195.87 grams of pure Umohoite .

Estimated Radioactivity from Umohoite - 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 / 7.39 cm 95,109,420 2.57E-03 3,882,185.43 1,276.33
100 gm / 3.43 cm 9,510,942 2.57E-04 388,218.54 127.63
10 gm / 1.59 cm 951,094 2.57E-05 38,821.85 12.76
1 gm / 7.39 mm 95,109 2.57E-06 3,882.19 1.28
0.1 gm / 3.43 mm 9,511 2.57E-07 388.22 0.13
0.01 gm / 1.59 mm 951 2.57E-08 38.82 0.01
0.001 gm / 0.74 mm 95 2.57E-09 3.88 0.00

Weight of pure Umohoite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.74 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
 

Umohoite Classification

Help on  Dana Class: Dana Class: 49.02.02.01 (49)Basic and Hydrated Molybdates and Tungstates
  (49.02)(Hydrated)
  (49.02.02)Dana Group
 
49.02.02.01 Umohoite [(UO2)MoO4]•H2O P1 1
Help on  Strunz Class: Strunz Class: 04.GC.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.G - Uranyl Hydroxides
  04.GC -With additional cations; with UO2(O,OH)6 hexagonal polyhedra
 
04.GC.10 Umohoite [(UO2)MoO4]•H2O P1 1
 

Other Umohoite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, v 86, p 379) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Umohoite :
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 Umohoite Specimen Label here :

Umohoite

[(UO2)MoO4]•H2O
Dana No: 49.02.02.01 Strunz No: 04.GC.10
Locality:

 

Notes:

 

 
   
 


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