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Hallimondite

Big Photo

Uranium deposit, Ellweiler, Birkenfeld, Hunsrück Mts, Rhineland-Palatinate, Germany
© Knut Eldjarn

Show Hallimondite Photos (5)
Formula:
Pb
 
2
(UO
 
2
)[AsO
 
4
]
 
2
 · nH
 
2
O, 0 ≤ n ≤ 0.5
System:TriclinicHardness:2½ - 3
Name:After Dr. Arthur Francis Hallimond (1890- 1968), British mineralogist, London, England, for his work with secondary uranium minerals.


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
Essential elements:As, O, Pb, U
All elements listed in formula:As, H, O, Pb, U

Relationship of Hallimondite to other Species

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
(H
 
2
O)
 
8
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
Mg(UO
 
2
)
 
2
(AsO
 
4
)
 
2
·12H
 
2
O
20.7.8Arsenuranylite
Ca(UO
 
2
)
 
4
[(OH)
 
2
|AsO
 
4
]
 
2
 · 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
[O|AsO
 
4
]
 
2
 · 5H
 
2
O
20.7.17Asselbornite
Pb(UO
 
2
)
 
4
(BiO)
 
3
(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, K. (1965): Hallimondite, a new uranium mineral from the Michael Mine near Reichenbach (Black Forest, Germany). American Mineralogist 50, 1143-1157.

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) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.

Articles/Blogs about Hallimondite

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    Localities for Hallimondite

    (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
    • Rhineland-Palatinate
      • Hunsrück Mts
        • Birkenfeld
          • Ellweiler
    		Aufschluss 69/(7+8), Lapis 79/(7+8)
    Mineral and/or Locality
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