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Petscheckite Mineral Data

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General Petscheckite Information

Help on Chemical  Formula: Chemical Formula: U++++Fe++(Nb,Ta)2O8
Help on Composition: Composition: Molecular Weight = 651.70 gm
   Uranium   36.52 %  U    41.43 % UO2
   Tantalum  13.88 %  Ta   16.95 % Ta2O5
   Niobium   21.38 %  Nb   30.59 % Nb2O5
   Iron       8.57 %  Fe   11.02 % FeO
   Oxygen    19.64 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: UFe2+Nb1.5Ta0.5O8
Help on Environment: Environment: Petscheckite is hypothesized on theoretical grounds, having altered to oxypetscheckite and hydroxypetscheckite.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Antsaoka I pegmatite, Berere district, Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Eckhard Petsch (1939-), of Idar-Oberstein, Germany, who was a noteworthy prospector in Madagascar.
Help on Name Pronunciation: Name Pronunciation: Petscheckite + Pronunciation Say PETSCHECKITE
Help on Synonym: Synonym: Hydroxypetscheckite
  Oxypetscheckite
 

Petscheckite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.62616
Help on Cell Dimensions: Cell Dimensions: a = 6.42, c = 4.02, Z = 1; V = 143.49 Den(Calc)= 7.54
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 31m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.21(1), 4.02(1), 2.51(0.8),
 

Physical Properties of Petscheckite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 5.5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: brown black
 

Optical Properties of Petscheckite

Help on Optical Data: Optical Data: NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.1697) where Ncalc=Dcalc*KC+1
NCalc= 1.93 - from Gladstone-Dale relationship (KC = 0.1697) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Petscheckite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.48 gm/cc
note: Specific Gravity of Petscheckite =7.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0045573699
Boson Index = 0.9954426301
Help on Photoelectric: Photoelectric: PEPetscheckite =1,168.76 barns/electron
U=PEPetscheckite x relectron=7,572.38 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 2,675,160.58 (Gamma Ray American Petroleum Institute Units)
Concentration of Petscheckite per GRapi unit = 373.81 (PPB)

Petscheckite 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) 11.37 ± 2.84 grams of pure Petscheckite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1137.0 ±284.25 grams of pure Petscheckite .

Estimated Radioactivity from Petscheckite - 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 / 6.33 cm 65,378,044 1.77E-03 2,675,160.58 879.50
100 gm / 2.94 cm 6,537,804 1.77E-04 267,516.06 87.95
10 gm / 1.36 cm 653,780 1.77E-05 26,751.61 8.80
1 gm / 6.33 mm 65,378 1.77E-06 2,675.16 0.88
0.1 gm / 2.94 mm 6,538 1.77E-07 267.52 0.09
0.01 gm / 1.36 mm 654 1.77E-08 26.75 0.01
0.001 gm / 0.63 mm 65 1.77E-09 2.68 0.00

Weight of pure Petscheckite in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.54 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
 

Petscheckite Classification

Help on  Dana Class: Dana Class: 08.01.09.02 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.09)Dana Group
 
08.01.09.01 Liandratite U(Nb,Ta)2O8 P 31m 3 2/m
 
08.01.09.02 Petscheckite UFe(Nb,Ta)2O8 P 31m 3 2/m
Help on  Strunz Class: Strunz Class: 04.DH.35 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.35 Liandratite U(Nb,Ta)2O8 P 31m 3 2/m
 
04.DH.35 Petscheckite UFe(Nb,Ta)2O8 P 31m 3 2/m
 

Other Petscheckite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Petscheckite :
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 Petscheckite Specimen Label here :

Petscheckite

U++++Fe++(Nb,Ta)2O8
Dana No: 08.01.09.02 Strunz No: 04.DH.35
Locality:

 

Notes:

 

 
   
 


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