Hallimondite	IMA-A 1965-008
Uranium	40.2a.32.1 (Dana Classification Number)
(No Images)	7/E.08-20 (Strunz ID)

Property	Data	Remarks
Named for:	Arthur Francis Hallimond, (1890-1968), English mineralogist who contributed much to the mineralogy of uranium.
Alternate     Name(s):
Mineral Class:	Phosphates, Arsenates and Vanadates   Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-     Parsonsite - Byelorussite-(Ce) series
Chemical     Formula:	Pb2(UO2)(AsO4)2
Chemical     Composition:	Arsenic: (As) 15.57% Lead: (Pb) 43.07% Oxygen: (O) 16.63% Uranium: (U) 24.74%	by weight
Molecular     Weight:	962.27	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 4.4278 × 1004 1.20 × 10-06 0.58 5.79 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System: Triclinic - Pinacoidal Axial Ratios: a: 0.6803 b: 1 c: 0.6537 Cell Dimensions: a: 7.123 Å b: 10.469 Å c: 6.844 Å Z: 2 a: 100.6° b: 94.8° g: 91.26° V: 499.77 Å3 DenCalc: 6.39 H-M Symbol: -1 Space Group: P-1 X-Ray Diffraction:   By Intensity ( I/Io ) (1): 3.4 Å (0.9): 2.84 Å (0.6): 1.74 Å
Habit:
Cleavage:	[???] Indistinct
Fracture:	Conchoidal
Moh's     Hardness:	2.5 - 3
Density:	6.39	grams/cm3
Color:	Yellow
Streak:	Light yellow
Luster:	Subadamantine
Diaphaneity:	Transparent to Translucent
Pleochroism:	(x):   (y:)   (z:)
Ultra Violet     Fluorescence:	Long Wave:   Short Wave:
Magnetism:	Non-magnetic
Occurance:
Associated     Minerals:	Arsenic, Chalcopyrite, Copper, Covellite, Galena, Greenockite, Hallimondite, Hügelite, Kasolite, Marcasite, Metaheinrichite, Novácekite, Pyrite, Silver, Sphalerite, Zeunerite Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found at both sites with Hallimondite
Localities:	Rare Hallimondite Localities
Notes:	Very radioactive a- and b-particles, g-rays. Crystals are probably metamic.