Hallimondite Mineral Data

General Hallimondite Information

Chemical Formula:

Pb2(UO2)(AsO4)2

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

Empirical Formula:

Pb₂(UO₂)(AsO₄)₂

Environment:

Secondary mineral found on a museum specimen from an oxidizing As-Pb-bearing deposit, formed by alteration of galena.

IMA Status:

Approved IMA 1965

Locality:

Michael mine, Weiler, near Lahr, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Arthur Francis Hallimond (1890-1968), British mineralogist, London, England, for his work with secondary uranium minerals.

Name Pronunciation:

Hallimondite + Pronunciation

Hallimondite Image

Images:

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

Axial Ratios:

a:b:c =0.6803:1:0.6537

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

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 3.4(1), 2.84(0.9), 1.74(0.6),

Crystal Structure:

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Locock A J , Burns P C , Flynn T M , American Mineralogist , 90 (2005) p.240-246, The role of water in the structures of synthetic hallimondite, Pb2[(UO2)(AsO4)2](H2O)n, and synthetic parsonsite, Pb2[(UO2)(PO4)2](H2O)n, 0 < n < 0.5

Physical Properties of Hallimondite

Cleavage:

{???} Indistinct

Color:

Yellow.

Density:

6.39

Diaphaneity:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Subadamantine

Streak:

light yellow

Optical Properties of Hallimondite

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

Optical Data:

Biaxial (+), a=1.882, g=1.915, bire=0.0330, 2V(Meas)=80.

Calculated Properties of Hallimondite

Electron Density:

Bulk Density (Electron Density)=5.35 gm/cc
note: Specific Gravity of Hallimondite =6.40 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Hallimondite=1,474.95 barns/electron
U=PE_Hallimondite x r_electron=7,887.13 barns/cc.

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 Becquerels (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

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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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: