Mineralogy Database

Hallimondite Mineral Data

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General Hallimondite Information

Help on Chemical  Formula: Chemical Formula: Pb2(UO2)(AsO4)2
Help on Composition: Composition: Molecular Weight = 962.27 gm
   Uranium  24.74 %  U    28.06 % UO2
   Arsenic  15.57 %  As   23.89 % As2O5
   Lead     43.07 %  Pb   46.39 % PbO
   Oxygen   16.63 %  O
           ______        ______ 
           100.00 %       98.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2(UO2)(AsO4)2
Help on Environment: Environment: Secondary mineral found on a museum specimen from an oxidizing As-Pb-bearing deposit, formed by alteration of galena.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Michael mine, Weiler, near Lahr, Black Forest, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Arthur Francis Hallimond (1890-1968), British mineralogist, London, England, for his work with secondary uranium minerals.
Help on Name Pronunciation: Name Pronunciation: Hallimondite + Pronunciation Say HALLIMONDITE
 

Hallimondite Image

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  Hallimondite

Comments: Yellow scaly crusts of hallimondite.
Location: Ellweiler, near Richenbach, Rheinland-Pfalz, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hallimondite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6803:1:0.6537
Help on Cell Dimensions: Cell Dimensions: a = 7.123, b = 10.469, c = 6.844, Z = 2; alpha = 100.6°, beta = 94.8°, gamma = 91.26° V = 499.77 Den(Calc)= 6.39
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.4(1), 2.84(0.9), 1.74(0.6),
 

Physical Properties of Hallimondite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Yellow.
Help on Density: Density: 6.39
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luster: Luster: Subadamantine
Help on Streak: Streak: light yellow
 

Optical Properties of Hallimondite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.093 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1404,KPDmeas= 0.1406,KC= 0.1285
Ncalc = 1.82
Help on Optical Data: Optical Data: Biaxial (+), a=1.882, g=1.915, bire=0.0330, 2V(Meas)=80.
 

Calculated Properties of Hallimondite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.35 gm/cc
note: Specific Gravity of Hallimondite =6.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEHallimondite =1,474.95 barns/electron
U=PEHallimondite x relectron=7,887.13 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,761,688.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Hallimondite per GRapi unit = 567.64 (PPB)

Hallimondite 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) 17.27 ± 4.32 grams of pure Hallimondite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1726.6 ±431.64 grams of pure Hallimondite .

Estimated Radioactivity from Hallimondite - 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 / 6.68 cm 44,277,953 1.20E-03 1,761,688.43 579.19
100 gm / 3.10 cm 4,427,795 1.20E-04 176,168.84 57.92
10 gm / 1.44 cm 442,780 1.20E-05 17,616.88 5.79
1 gm / 6.68 mm 44,278 1.20E-06 1,761.69 0.58
0.1 gm / 3.10 mm 4,428 1.20E-07 176.17 0.06
0.01 gm / 1.44 mm 443 1.20E-08 17.62 0.01
0.001 gm / 0.67 mm 44 1.20E-09 1.76 0.00

Weight of pure Hallimondite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.40 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
 

Hallimondite Classification

Help on  Dana Class: Dana Class: 40.02a.32.01 (40)Hydrated Phosphates, etc
  (40.02a)where A++ (B++)2 (XO4) � x(H2O), containing (UO2)++
  (40.02a.32)Dana Group
 
40.02a.32.01 Hallimondite Pb2(UO2)(AsO4)2 P1 1
Help on  Strunz Class: Strunz Class: 08.EA.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.E - Uranyl Phosphates and Arsenates
  08.EA -UO2:RO4 = 1:2
 
08.EA.10 Hallimondite Pb2(UO2)(AsO4)2 P1 1
 
08.EA.10 Parsonsite Pb2(UO2)(PO4)2•2(H2O) P1 1
 

Other Hallimondite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hallimondite :
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 Hallimondite Specimen Label here :

Hallimondite

Pb2(UO2)(AsO4)2
Dana No: 40.02a.32.01 Strunz No: 08.EA.10
Locality:

 

Notes:

 

 
   
 


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