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Hallimondite

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Formula:
Pb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
System:
Triclinic
Hardness:
2½ - 3
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.

Classification of Hallimondite

Approved 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
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First Recorded Occurrence of Hallimondite

Year of Discovery:
1961

Physical Properties of Hallimondite

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

Crystallography of Hallimondite

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

Optical Data of Hallimondite

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 Hallimondite

Formula:
Pb2(UO2)(AsO4)2 · nH2O, 0 ≤ n ≤ 0.5
Essential elements:
All elements listed in formula:

Relationship of Hallimondite to other Species

Series:
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.10ParsonsitePb2(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(UO2)3(AsO4)2 · 12H2O (?)
20.7.2Natrouranospinite(Na2,Ca)(UO2)2(AsO4)2 · 5H2O
20.7.3AbernathyiteK2(UO2)2(AsO4)2 · 6H2O
20.7.4MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
20.7.5ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
20.7.6MetanováčekiteMg(UO2)2(AsO4)2 · 4-8H2O
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
20.7.14ArsenuranospathiteHAl(UO2)4(AsO4)4 · 40H2O
20.7.16HügelitePb2(UO2)3(AsO4)2O2 · 5H2O
20.7.17AsselbornitePb(BiO)3(UO2)4(AsO4)2(OH)7·4H2O
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

Localities for Hallimondite

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
 
  • 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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