Przhevalskite Mineral Data

General Przhevalskite Information

Chemical Formula:

Pb(UO2)2(PO4)2•4(H2O)

Composition:

Molecular Weight = 1,009.26 gm

Uranium 47.17 % U 53.51 % UO₂

Phosphorus 6.14 % P 14.06 % P₂O₅

Hydrogen 0.80 % H 7.14 % H₂O

Lead 20.53 % Pb 22.12 % PbO

Oxygen 25.36 % O

______ ______

100.00 % 96.83 % = TOTAL OXIDE

Empirical Formula:

Pb(UO₂)₂(PO₄)₂•4(H₂O)

Environment:

Found in the oxidation zone of a pitchblende-sulfide deposit.

IMA Status:

Valid Species (Pre-IMA) 1946

Locality:

Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Nikolai M. Przhevalsky (1839-1888), Russian explorer.

Name Pronunciation:

Przhevalskite + Pronunciation

Przhevalskite Crystallography

Axial Ratios:

a:c = 1:2.51657

Cell Dimensions:

a = 7.24, c = 18.22, Z = 2; V = 955.05 Den(Calc)= 3.51

Crystal System:

Tetragonal Space Group: Unk

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

By Intensity(I/I_o): 3.61(1), 9.08(0.9), 1.619(0.6),

Physical Properties of Przhevalskite

Cleavage:

{001} Distinct

Color:

Yellow, Bright greenish yellow.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Foliated - Two dimensional platy forms.

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-Fluorescent.

Luster:

Adamantine - Pearly

Streak:

light yellow

Optical Properties of Przhevalskite

Gladstone-Dale:

CI calc= -0.6 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2127,KC= 0.1329
Ncalc = 1.47

Optical Data:

Biaxial (-), a=1.739, b=1.749, g=1.752, bire=0.0130, 2V(Calc)=56, 2V(Meas)=30.

Calculated Properties of Przhevalskite

Electron Density:

Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Przhevalskite =3.51 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Przhevalskite}=1,618.56 barns/electron
U=PE_{Przhevalskite} x r_electron=4,863.48 barns/cc.

Radioactivity:

GRapi = 3,441,927.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Przhevalskite per GRapi unit = 290.53 (PPB)

Przhevalskite 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) 8.84 ± 2.21 grams of pure Przhevalskite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 883.71 ±220.93 grams of pure Przhevalskite .

**Estimated Radioactivity from Przhevalskite** - 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 / 8.16 cm	84,432,564	2.28E-03	3,441,927.29	1,131.59
100 gm / 3.79 cm	8,443,256	2.28E-04	344,192.73	113.16
10 gm / 1.76 cm	844,326	2.28E-05	34,419.27	11.32
1 gm / 8.16 mm	84,433	2.28E-06	3,441.93	1.13
0.1 gm / 3.79 mm	8,443	2.28E-07	344.19	0.11
0.01 gm / 1.76 mm	844	2.28E-08	34.42	0.01
0.001 gm / 0.82 mm	84	2.28E-09	3.44	0.00

Weight of pure Przhevalskite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.51 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

Przhevalskite Classification

Dana Class:

40.02a.21.01 (40)Hydrated Phosphates, etc

(40.02a)where A++ (B++)2 (XO4) ï¿½ x(H2O), containing (UO2)++

(40.02a.21)Dana Group

40.02a.21.01 Przhevalskite Pb(UO2)2(PO4)2•4(H2O) Unk Tetra

Strunz Class:

08.EB.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EB -UO2:RO4 = 1:1

08.EB.10 Bassetite Fe(UO2)2(PO4)2•8(H2O) P 2₁/m 2/m

08.EB.10 Lehnerite Mn[UO2/PO4]2•8(H2O) P 2₁/n 2/m

08.EB.10 Metazeunerite Cu(UO2)2(AsO4)2•8(H2O) P 4/n 4/m

08.EB.10 Meta-autunite Ca(UO2)2(PO4)2•2-6(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.10 Metauranocircite Ba(UO2)2(PO4)2•6-8(H2O) P 2₁ 2

08.EB.10 Metauranospinite Ca(UO2)2(AsO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m

08.EB.10 Metaheinrichite Ba(UO2)2(AsO4)2•8(H2O) P 2₁ 2

08.EB.10 Metakahlerite Fe(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

08.EB.10 Metakirchheimerite Co(UO2)2(AsO4)2•8(H2O) P 4/mmm 4/m 2/m 2/m

08.EB.10 Metalodevite Zn(UO2)2(AsO4)2•10(H2O) P 4₁/m 4/m

08.EB.10 Metanovacekite Mg(UO2)2(AsO4)2•4-8(H2O) P 4/n 4/m

08.EB.10 Metatorbernite Cu(UO2)2(PO4)2•8(H2O) P 4/n 4/m

08.EB.10 Przhevalskite Pb(UO2)2(PO4)2•4(H2O) Unk Tetra

Other Przhevalskite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Przhevalskite :
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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Przhevalskite

Pb(UO2)2(PO4)2•4(H2O)
Dana No: 40.02a.21.01 Strunz No: 08.EB.10
Locality:

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