Mineralogy Database

Vyacheslavite Mineral Data

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General Vyacheslavite Information

Help on Chemical  Formula: Chemical Formula: U++++(PO4)(OH)•2.5(H2O)
Help on Composition: Composition: Molecular Weight = 395.05 gm
   Uranium     60.25 %  U    68.35 % UO2
   Phosphorus   7.84 %  P    17.97 % P2O5
   Hydrogen     1.53 %  H    13.68 % H2O
   Oxygen      30.38 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: U(PO4)(OH)•2.5(H2O)
Help on Environment: Environment: Found on quartz crystals associated with octahedral pyrite.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Uzbekistan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Vyacheslav Gavilovich Melkov (1911-1991), Russian mineralogist.
Help on Name Pronunciation: Name Pronunciation: Vyacheslavite + Pronunciation Say VYACHESLAVITE
 

Vyacheslavite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7648:1:1.3604
Help on Cell Dimensions: Cell Dimensions: a = 6.96, b = 9.1, c = 12.38, Z = 6; V = 784.10 Den(Calc)= 5.02
Help on Crystal System: Crystal System: Orthorhombic Space Group: C mcm, C mc21, C 2cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.19(1), 2.69(0.7), 4.56(0.6),
 

Physical Properties of Vyacheslavite

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Green, Dark green.
Help on Density: Density: 4.9 - 5.01, Average = 4.95
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Streak: Streak: green
 

Optical Properties of Vyacheslavite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1433,KPDmeas= 0.1451,KC= 0.1477
Ncalc = 1.72 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=1.726-1.729, g=1.729-1.731, bire=0.0290-0.0310
Help on Pleochroism (x): Pleochroism (x): weak green.
Help on Pleochroism (y): Pleochroism (y): weak green.
Help on Pleochroism (z): Pleochroism (z): weak green.
 

Calculated Properties of Vyacheslavite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.34 gm/cc
note: Specific Gravity of Vyacheslavite =4.96 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0044863483
Boson Index = 0.9955136517
Help on Photoelectric: Photoelectric: PEVyacheslavite =1,561.22 barns/electron
U=PEVyacheslavite x relectron=6,775.43 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,498,260.74 (Gamma Ray American Petroleum Institute Units)
Concentration of Vyacheslavite per GRapi unit = 222.31 (PPB)

Vyacheslavite 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) 6.76 ± 1.69 grams of pure Vyacheslavite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 676.19 ±169.05 grams of pure Vyacheslavite .

Estimated Radioactivity from Vyacheslavite - 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 / 7.28 cm 107,853,755 2.91E-03 4,498,260.74 1,478.88
100 gm / 3.38 cm 10,785,376 2.91E-04 449,826.07 147.89
10 gm / 1.57 cm 1,078,538 2.91E-05 44,982.61 14.79
1 gm / 7.28 mm 107,854 2.91E-06 4,498.26 1.48
0.1 gm / 3.38 mm 10,785 2.91E-07 449.83 0.15
0.01 gm / 1.57 mm 1,079 2.91E-08 44.98 0.01
0.001 gm / 0.73 mm 108 2.91E-09 4.50 0.00

Weight of pure Vyacheslavite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.96 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
 

Vyacheslavite Classification

Help on  Dana Class: Dana Class: 40.04.08.03 (40)Hydrated Phosphates, etc
  (40.04)where A+++ XO4 � x(H2O)
  (40.04.08)Ningyoite Group
 
40.04.08.01 Ningyoite (U,Ca,Ce)2(PO4)2•1-2(H2O) P 222 2 2 2
 
40.04.08.02 Lermontovite U(PO4)(OH)•(H2O)(?) C cca 2/m 2/m 2/m
 
40.04.08.03 Vyacheslavite U(PO4)(OH)•2.5(H2O) C mcm, C mc21, C 2cm Ortho
Help on  Strunz Class: Strunz Class: 08.DN.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DN -With only large cations
 
08.DN.20 Vyacheslavite U(PO4)(OH)•2.5(H2O) C mcm, C mc21, C 2cm Ortho
 

Other Vyacheslavite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Vyacheslavite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Uranium Minerals

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

Vyacheslavite

U++++(PO4)(OH)•2.5(H2O)
Dana No: 40.04.08.03 Strunz No: 08.DN.20
Locality:

 

Notes:

 

 
   
 


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