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|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.|
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
|Class (H-M):||1 - Pinacoidal|
|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 Å³|
Optical Data of Hallimondite
|RI values:||nα = 1.882 nγ = 1.915|
|Maximum Birefringence:||δ = 0.033|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r > v|
Chemical Properties of Hallimondite
|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):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Hallimondite
|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
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
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.
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