Vyacheslavite Mineral Data

Vyacheslavite Mineral Data +

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General Vyacheslavite Information

Chemical Formula:

U++++(PO4)(OH)·2.5(H2O)

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

Empirical Formula:

U(PO₄)(OH)·2.5(H₂O)

Environment:

Found on quartz crystals associated with octahedral pyrite.

IMA Status:

Approved IMA 1984

Locality:

Uzbekistan. Link to MinDat.org Location Data.

Name Origin:

Named for Vyacheslav Gavilovich Melkov (1911-1991), Russian mineralogist.

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Vyacheslavite Crystallography

Axial Ratios:

a:b:c =0.7648:1:1.3604

Cell Dimensions:

a = 6.96, b = 9.1, c = 12.38, Z = 6; V = 784.10 Den(Calc)= 5.02

Crystal System:

OrthorhombicSpace Group: C mcm, C mc2₁, C 2cm

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

By Intensity(I/I_o): 6.19(1), 2.69(0.7), 4.56(0.6),

Physical Properties of Vyacheslavite

Cleavage:

[010] Distinct

Color:

Green, Dark green.

Density:

4.9 - 5.01, Average = 4.95

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Spherical - Spherical, rounded aggregates.

Habit:

Tabular - Form dimensions are thin in one direction.

Streak:

green

Optical Properties of Vyacheslavite

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

Optical Data:

Biaxial (-), a=1.7, b=1.726-1.729, g=1.729-1.731, bire=0.0290-0.0310

Pleochroism (x):

weak green.

Pleochroism (y):

weak green.

Pleochroism (z):

weak green.

Calculated Properties of Vyacheslavite

Electron Density:

r_electron=4.34 gm/cc
note: r_{Vyacheslavite}=4.96 gm/cc.

Fermion Index

Fermion Index = 0.00448
Boson Index = 0.99552

Photoelectric:

PE_{Vyacheslavite}=1,561.22 barns/electron
U=PE_{Vyacheslavite} x r_electron=6,775.43 barns/cc.

Radioactivity:

GRapi = 4,498,259.41 (Gamma Ray American Petroleum Institute Units)

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	107,853,747	2.91E-03	4,498,259.41	1,478.88
100 gm / 3.38 cm	10,785,375	2.91E-04	449,825.94	147.89
10 gm / 1.57 cm	1,078,537	2.91E-05	44,982.59	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

Dana Class:

40.4.8.3 (40)Hydrated Phosphates, etc

(40.4)where A+++ XO4 · x(H2O)

(40.4.8)Dana Group

40.4.8.1 Ningyoite (U,Ca,Ce)2(PO4)2·1-2(H2O) P 222 2 2 2

40.4.8.2 Lermontovite U(PO4)(OH)·(H2O)(?) C cca 2/m 2/m 2/m

40.4.8.3 Vyacheslavite U(PO4)(OH)·2.5(H2O) C mcm, C mc2₁, C 2cm Ortho

Strunz Class:

VII/D.43-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.43 - Vyacheslavite - Lermontovite series

VII/D.43-10 Vyacheslavite U(PO4)(OH)·2.5(H2O) C mcm, C mc2₁, C 2cm Ortho

VII/D.43-20 Lermontovite U(PO4)(OH)·(H2O)(?) C cca 2/m 2/m 2/m

Other Vyacheslavite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Vyacheslavite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 -École des Mines de Paris

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Vyacheslavite

U++++(PO4)(OH)·2.5(H2O)
Dana No: 40.4.8.3 Strunz No: VII/D.43-10
Locality:

Notes: