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Hallimondite

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Formula:
Pb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
Hardness:
2½ - 3
Specific Gravity:
6.445 (Calculated)
Crystal System:
Triclinic
Name:
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.


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Classification of HallimonditeHide

Approved
Approval Year:
1965
8.EA.10

8 : PHOSPHATES, ARSENATES, VANADATES
E : Uranyl phosphates and arsenates
A : UO2:RO4 = 1:2
40.2a.32.1

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
20.7.15

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

Physical Properties of HallimonditeHide

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

Optical Data of HallimonditeHide

Type:
Biaxial (+)
RI values:
nα = 1.882 nγ = 1.915
2V:
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:
Moderate
Dispersion:
r > v

Chemical Properties of HallimonditeHide

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

Crystallography of HallimonditeHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.12 Å, b = 10.48 Å, c = 6.86 Å
α = 101.2°, β = 95.7°, γ = 86.65°
Ratio:
a:b:c = 0.679 : 1 : 0.655
Unit Cell V:
498.64 ų
Z:
2

Type Occurrence of HallimonditeHide

Synonyms of HallimonditeHide

Other Language Names for HallimonditeHide

Relationship of Hallimondite to other SpeciesHide

Related Minerals - Nickel-Strunz GroupingHide

8.EA.05Orthowalpurgite(BiO)4(UO2)(AsO4)2 · 2H2OOrth.
8.EA.05Walpurgite(BiO)4(UO2)(AsO4)2 · 3H2OTric.
8.EA.05Phosphowalpurgite(BiO)4(UO2)(PO4)2 · 2H2OTric. 1 : P1
8.EA.10ParsonsitePb2(UO2)(PO4)2Tric. 1 : P1
8.EA.15UlrichiteCaCu(UO2)(PO4)2 · 4H2OMon.
8.EA.20LakebogaiteCaNaFe3+2H(UO2)2(PO4)4(OH)2 · 8H2OMon. m : Bb

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

20.7.1Trögerite(H3O)(UO2)(AsO4) · 3H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
20.7.2Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
20.7.3AbernathyiteK(UO2)(AsO4) · 3H2OTet. 4/mmm (4/m 2/m 2/m) : P4/ncc
20.7.4MetazeuneriteCu(UO2)2(AsO4)2 · 8H2OTet. 4/m : P42/n
20.7.5ZeuneriteCu(UO2)2(AsO4)2 · 12H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
20.7.6MetanováčekiteMg(UO2)2(AsO4)2 · 8H2OTet. 4/m : P4/n
20.7.7Nováčekite-IMg(UO2)2(AsO4)2 · 12H2OTric. 1 : P1
20.7.8ArsenuranyliteCa(UO2)4(AsO4)2(OH)4 · 6H2OOrth.
20.7.9MetauranospiniteCa(UO2)2(AsO4)2 · 8H2OTet. 4/m : P42/n
20.7.10UranospiniteCa(UO2)(AsO4)2 · 10H2OTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
20.7.11MetaheinrichiteBa(UO2)2(AsO4)2 · 8H2OTet. 4mm
20.7.12HeinrichiteBa(UO2)2(AsO4)2 · 10H2OMon. 2/m
20.7.13MetalodèviteZn(UO2)2(AsO4)2 · 10H2OTet.
20.7.14ArsenuranospathiteAl[(UO2)(AsO4)]2F(H2O)20Orth. mm2 : Pnn2
20.7.16HügelitePb2(UO2)3(AsO4)2O2 · 5H2OMon.
20.7.17AsselbornitePb(BiO)3(UO2)4(AsO4)2(OH)7·4H2OIso.
20.7.18MetakahleriteFe2+(UO2)2(AsO4)2 · 8H2OTric. 1 : P1
20.7.19KahleriteFe(UO2)2(AsO4)2 · 12H2OTet. 4/m : P42/n
20.7.20MetakirchheimeriteCo(UO2)2(AsO4)2 · 8H2OTric. 1 : P1

Other InformationHide

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 HallimonditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Walenta, K., Wimmenauer, W. (1961) Jahre. Geol. Land. Baden-Württemberg: 4: 21.
Fleischer, M. (1962) New mineral names. American Mineralogist: 47: 414-420.
Walenta, K. (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: 37: 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, P.C. (2005) U6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Internet Links for HallimonditeHide

Localities for HallimonditeHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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)
Mineral and/or Locality  
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