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Pb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
2½ - 3
Named in 1961 by Kurt Walenta and Wolfhard Wimmenauer in honor of Dr. Arthur Francis Hallimond [January 17,. 1890 Saltburn, Yorkshire, England, UK - September 2, 1968 London, England, UK], British mineralogist, London, England, for his work with secondary uranium minerals, metallurgy of carbon steel, refractory materials, banded iron ores, and other researches. Hallimond was an early tester and innovator of geomagnetic measuring devices and worked on the geomagnetism of rocks. Additionally he developed equipment for determining the refractive index of liquid mixtures, magnetic separation of minerals, use of Polaroid filters to replace Nicol prisms, reflected light microscopy, and major advances in petrographic microscope design. He wrote important books on microscopy and, in retirement, consulted for the Vickers Microscope company, Chance-Pilkington Research Laboratories and to the Atomic Energy Research Establishment at Harwell. He named the species bassetite and uranospathite.
Hallimondite-Parsonsite Series.
The arsenate analogue of Parsonsite.

Classification of Hallimondite

Approval Year:

E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2

2a : AB2(XO4)2·xH2O, containing (UO2)2+

20 : Arsenates (also arsenates with phosphate, but without other anions)
7 : Arsenates of U

Physical Properties of Hallimondite

Hardness (Mohs):
2½ - 3
6.445 g/cm3 (Calculated)

Optical Data of Hallimondite

Biaxial (+)
RI values:
nα = 1.882 nγ = 1.915
Measured: 80°
Max Birefringence:
δ = 0.033
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
r > v

Chemical Properties of Hallimondite

Pb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
IMA Formula:
Pb2(UO2)(AsO4)2 · nH2O
Elements listed in formula:

Crystallography of Hallimondite

Crystal System:
Class (H-M):
1 - Pinacoidal
Space Group:
Cell Parameters:
a = 7.12 Å, b = 10.48 Å, c = 6.86 Å
α = 101.2°, β = 95.7°, γ = 86.65°
a:b:c = 0.679 : 1 : 0.655
Unit Cell Volume:
V 498.64 ų

Type Occurrence of Hallimondite

Relationship of Hallimondite to other Species

Forms a series with Parsonsite (see here)
8.EA.05Orthowalpurgite(BiO)4(UO2)(AsO4)2 · 2H2O
8.EA.05Walpurgite(BiO)4(UO2)(AsO4)2 · 3H2O
8.EA.05Phosphowalpurgite(BiO)4(UO2)(PO4)2 · 2H2O
8.EA.15UlrichiteCaCu(UO2)(PO4)2 · 4H2O
8.EA.20LakebogaiteCaNaFe23+H(UO2)2(PO4)4(OH)2 · 8H2O
20.7.1Trögerite(H3O)(UO2)(AsO4) · 3H2O
20.7.2Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2O
20.7.3AbernathyiteK(UO2)(AsO4) · 3H2O
20.7.4MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
20.7.5ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
20.7.6MetanováčekiteMg(UO2)2(AsO4)2 · 8H2O
20.7.7Nováčekite-IMg(UO2)2(AsO4)2 · 12H2O
20.7.8ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2O
20.7.9MetauranospiniteCa(UO2)2(AsO4)2 · 8H2O
20.7.10UranospiniteCa(UO2)(AsO4)2 · 10H2O
20.7.11MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2O
20.7.12HeinrichiteBa(UO2)2(AsO4)2 · 10H2O
20.7.13MetalodèviteZn(UO2)2(AsO4)2 · 10H2O
20.7.16HügelitePb2(UO2)3(AsO4)2O2 · 5H2O
20.7.18MetakahleriteFe2+(UO2)2(AsO4)2 · 8H2O
20.7.19KahleriteFe(UO2)2(AsO4)2 · 12H2O
20.7.20MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2O

Other Names for Hallimondite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Hallimondite

Reference List:
Walenta, Kurt and Wimmenauer, W. (1961) Jahre. Geol. Land. Baden-Württemberg, v. 4, p. 21.
Walenta, Kurt (1965): Hallimondite, a new uranium mineral from the Michael Mine near Reichenbach (Black Forest, Germany). American Mineralogist 50, 1143-1157.
W. C. S. (1969) Arthur Francis Hallimond (1890-1968), Mineralogical Magazine, v. 37, p. 313-316.
Locock, A.J., Burns, P.C., Flynn, T.M. (2005): 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. American Mineralogist, 90, 240-246.
Burns, Peter C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for Hallimondite URL:
Please feel free to link to this page.

Localities for Hallimondite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany (TL)
  • Baden-Württemberg
    • Black Forest
      • Lahr
        • Reichenbach
          • Weiler
Am Min 50 (1965), 1143-1157
      • Schenkenzell
        • Wittichen
          • Böckelsbach valley
Markl, G. & Slotta, C. (2011): Die Uranmineralien des Lagerstättenreviers Wittichen im mittleren Schwarzwald. Lapis 36 (3), 25-37; 54 (in German).
  • Rhineland-Palatinate
    • Hunsrück
      • Birkenfeld
        • Ellweiler
Aufschluss 69/(7+8), Lapis 79/(7+8)
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