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Piretite Mineral Data

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General Piretite Information

Help on Chemical  Formula: Chemical Formula: Ca(UO2)3(SeO3)2(OH)4-4(H2O)
Help on Composition: Composition: Molecular Weight = 1,244.17 gm
   Calcium    3.22 %  Ca    4.51 % CaO
   Uranium   57.39 %  U    65.11 % UO2
   Hydrogen   0.97 %  H     8.69 % H2O
   Selenium  12.69 %  Se   17.84 % SeO2
   Oxygen    25.72 %  O
            ______        ______ 
            100.00 %       96.14 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(UO2)3(SeO3)2(OH)4•4(H2O)
Help on Environment: Environment: In the alteration zone.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Shinkolobwe uranium deposit, Shaba, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Dr. Paul Piret (1932- ), Professor of Crystallography, University of Louvain-la-Neuve, Belgium.
Help on Name Pronunciation: Name Pronunciation: Piretite Say PIRETITE
Help on Synonym: Synonym: IMA1996-002
 

Piretite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4091:1:1.0274
Help on Cell Dimensions: Cell Dimensions: a = 7.01, b = 17.135, c = 17.606, Z = 4; V = 2,114.77 Den(Calc)= 3.91
Help on Crystal System: Crystal System: Orthorhombic Space Group: P mn21,Pmnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.032(1), 3.51(1), 8.79(0.8),
 

Physical Properties of Piretite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Lemon yellow.
Help on Density: Density: 4 - 4.01, Average = 4
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Fragile - Crystals with a delicate and easily injured structure.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Pearly
Help on Streak: Streak: pale yellow
 

Optical Properties of Piretite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.21 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.24 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1722,KPDmeas= 0.1681,KC= 0.1389
Ncalc = 1.54 - 1.56
Help on Optical Data: Optical Data: Biaxial (-), a=1.54, b=1.73, g=1.75, bire=0.2100, 2V(Calc)=32, 2V(Meas)=33. Dispersion weak, r > v.
 

Calculated Properties of Piretite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.45 gm/cc
note: Specific Gravity of Piretite =4.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPiretite =1,522.12 barns/electron
U=PEPiretite x relectron=5,252.51 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,215,231.46 (Gamma Ray American Petroleum Institute Units)
Concentration of Piretite per GRapi unit = 237.23 (PPB)

Piretite 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) 7.22 ± 1.80 grams of pure Piretite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 721.59 ±180.40 grams of pure Piretite .

Estimated Radioactivity from Piretite - 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 / 7.81 cm 102,736,545 2.78E-03 4,215,231.46 1,385.83
100 gm / 3.63 cm 10,273,655 2.78E-04 421,523.15 138.58
10 gm / 1.68 cm 1,027,365 2.78E-05 42,152.31 13.86
1 gm / 7.81 mm 102,737 2.78E-06 4,215.23 1.39
0.1 gm / 3.63 mm 10,274 2.78E-07 421.52 0.14
0.01 gm / 1.68 mm 1,027 2.78E-08 42.15 0.01
0.001 gm / 0.78 mm 103 2.78E-09 4.22 0.00

Weight of pure Piretite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.01 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
 

Piretite Classification

Help on  Dana Class: Dana Class: 34.07.03.02 (34)Selenites - Tellurites - Sulfites
  (34.07)Dana Type
  (34.07.03)Dana Group
 
34.07.03.01 Guilleminite Ba(UO2)3(SeO3)2O2•3(H2O) P 21nm mm2
 
34.07.03.02 Piretite! Ca(UO2)3(SeO3)2(OH)4-4(H2O) P mn21,Pmnm Ortho
Help on  Strunz Class: Strunz Class: 04.JJ.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JJ -Selenites with additional anions, with H2O
 
04.JJ.15 Piretite! Ca(UO2)3(SeO3)2(OH)4-4(H2O) P mn21,Pmnm Ortho
 

Other Piretite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.82,p1040,1997) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Piretite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

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

Piretite

Ca(UO2)3(SeO3)2(OH)4-4(H2O)
Dana No: 34.07.03.02 Strunz No: 04.JJ.15
Locality:

 

Notes:

 

 
   
 


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