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Hallimondite

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Formula:
Pb
 
2
(UO
 
2
)(AsO
 
4
)
 
2
· nH
 
2
O, 0 ≤ n ≤ 0.5
System:TriclinicHardness: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

IMA status:Approved 1965
Strunz 8th edition ID:7/E.08-20
Nickel-Strunz 10th (pending) edition ID:8.EA.10

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

40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2a : AB2(XO4)2·xH2O, containing (UO2)2+
Hey's CIM Ref.:20.7.15

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

Type Locality:Michael Mine, Weiler, Reichenbach, Lahr, Black Forest, Baden-Württemberg, Germany
Year of Discovery:1961

Physical Properties of Hallimondite

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

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°
Maximum Birefringence:δ = 0.033

Chart 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:
Pb
 
2
(UO
 
2
)(AsO
 
4
)
 
2
· nH
 
2
O, 0 ≤ n ≤ 0.5
Simplified for copy/paste:Pb2(UO2)(AsO4)2·nH2O, 0 ≤ n ≤ 0.5
Essential elements:As, H, O, Pb, U
All elements listed in formula:As, H, O, Pb, U

Relationship of Hallimondite to other Species

Series:Forms a series with Parsonsite (see here)
Related Minerals - Nickel-Strunz Grouping):

- +
8.EA.05Orthowalpurgite
(BiO)
 
4
(UO
 
2
)(AsO
 
4
)
 
2
· 2H
 
2
O
8.EA.05Walpurgite
(BiO)
 
4
(UO
 
2
)(AsO
 
4
)
 
2
· 3H
 
2
O
8.EA.05Phosphowalpurgite
(BiO)
 
4
(UO
 
2
)(PO
 
4
)
 
2
· 2H
 
2
O
8.EA.10Parsonsite
Pb
 
2
(UO
 
2
)(PO
 
4
)
 
2
· 2H
 
2
O
8.EA.15Ulrichite
CaCu(UO
 
2
)(PO
 
4
)
 
2
· 4H
 
2
O
8.EA.20Lakebogaite
CaNaFe
3+
2
H(UO
 
2
)
 
2
(PO
 
4
)
 
4
(OH)
 
2
· 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
20.7.1Trögerite
(UO
 
2
)
 
3
(AsO
 
4
)
 
2
· 12H
 
2
O (?)
20.7.2Natrouranospinite
(Na
 
2
,Ca)(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 5H
 
2
O
20.7.3Abernathyite
K
 
2
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 6H
 
2
O
20.7.4Metazeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 8H
 
2
O
20.7.5Zeunerite
Cu(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 12H
 
2
O
20.7.6Metanováčekite
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 4-8H
 
2
O
20.7.7Nováčekite-I
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 12H
 
2
O
20.7.8Arsenuranylite
Ca(UO
 
2
)
 
4
(AsO
 
4
)
 
2
(OH)
 
4
· 6H
 
2
O
20.7.9Metauranospinite
Ca(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 8H
 
2
O
20.7.10Uranospinite
Ca(UO
 
2
)(AsO
 
4
)
 
2
· 10H
 
2
O
20.7.11Metaheinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 8H
 
2
O
20.7.12Heinrichite
Ba(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 10H
 
2
O
20.7.13Metalodèvite
Zn(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 10H
 
2
O
20.7.14Arsenuranospathite
HAl(UO
 
2
)
 
4
(AsO
 
4
)
 
4
· 40H
 
2
O
20.7.16Hügelite
Pb
 
2
(UO
 
2
)
 
3
(AsO
 
4
)
 
2
O
 
2
· 5H
 
2
O
20.7.17Asselbornite
Pb(BiO)
 
3
(UO
 
2
)
 
4
(AsO
 
4
)
 
2
(OH)
 
7
·4H
 
2
O
20.7.18Metakahlerite
Fe
2+
 
(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 8H
 
2
O
20.7.19Kahlerite
Fe(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 12H
 
2
O
20.7.20Metakirchheimerite
Co(UO
 
2
)
 
2
(AsO
 
4
)
 
2
· 8H
 
2
O

Other Names for Hallimondite

Synonyms:
IMA1965-008
Other Languages:
German:Hallimondit
Russian:Хеллимондит
Spanish:Hallimondita

Other Information

Health Warning: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

Search Engines:
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  • External Links:
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  • Look for Hallimondite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Hallimondite

    The 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. ? 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)
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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