Hallimondite Mineral Data

Hallimondite Mineral Data +

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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

IMA Status:

Approved IMA 1965

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

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= -0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1406,KPDmeas= 0.1406,KC= 0.1285

Optical Data:

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

Calculated Properties of Hallimondite

Electron Density:

r_electron=5.34 gm/cc
note: r_Hallimondite=6.39 gm/cc.

Fermion Index

Fermion Index = 0.09703
Boson Index = 0.90297

Photoelectric:

PE_Hallimondite=1,474.95 barns/electron
U=PE_Hallimondite x r_electron=7,874.81 barns/cc.

Radioactivity:

GRapi = 1,761,687.59 (Gamma Ray American Petroleum Institute Units)

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 / 6.69 cm	44,277,941	1.20E-03	1,761,687.59	579.18
100 gm / 3.10 cm	4,427,794	1.20E-04	176,168.76	57.92
10 gm / 1.44 cm	442,779	1.20E-05	17,616.88	5.79
1 gm / 6.69 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 6.39 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:

40.2a.32.1 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.32)Dana Group

40.2a.32.1 Hallimondite Pb2(UO2)(AsO4)2 P1 1

Strunz Class:

VII/E.08-20 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-

VII/E.08 - Parsonsite - Byelorussite-(Ce) series

VII/E.08-10 Parsonsite Pb2(UO2)(PO4)2·2(H2O) P1 1

VII/E.08-20 Hallimondite Pb2(UO2)(AsO4)2 P1 1

VII/E.08-85 Byelorussite-(Ce) NaBa2(Ce,La)2MnTi2Si8O26(F,OH)·(H2O) P 2₁2₁2₁ 2 2 2

Other Hallimondite Information

References:

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - Uranium Minerals 12 -École des Mines de Paris

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Hallimondite

Pb2(UO2)(AsO4)2
Dana No: 40.2a.32.1 Strunz No: VII/E.08-20
Locality:

Notes: