Parsonsite	IMA-GP
Uranium	40.2a.31.1 (Dana Classification Number)
(No Images)	7/E.08-10 (Strunz ID)

Property	Data	Remarks
Named for:	Arthur L. Parsons (1873-?), Professor of Minerology, University of Toronto, 1929 President of The American Mineralogical Society
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)(PO4)2 · 1-2H2O
Chemical     Composition:	Hydrogen: (H) 0.44% Lead: (Pb) 45.52% Oxygen: (O) 21.09% Phosphorus: (P) 6.80% Uranium: (U) 26.15%	by weight
Molecular     Weight:	910.40	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 4.6800 × 1004 1.26 × 10-06 0.62 62.13 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System: Triclinic - Pinacoidal Axial Ratios: a: 0.6589 b: 1 c: 0.6423 Cell Dimensions: a: 6.842 Å b: 10.383 Å c: 6.67 Å Z: 2 a: 101.26° b: 98.174° g: 86.378° V: 459.08 Å3 DenCalc: 6.59 H-M Symbol: -1 Space Group: P-1 X-Ray Diffraction:   By Intensity ( I/Io ) (1): 3.253 Å (1): 3.283 Å (0.65): 4.233 Å
Habit:	Microscopic crystals Micaceous Pseudo-hexagonal
Cleavage:	[001]   [010] Indistinct [100]
Fracture:	Conchoidal
Moh's     Hardness:	2.5 - 3
Density:	5.72 - 6.29	grams/cm3
Color:	Brown, Greenish brown, Yellow, Yellow brown, or Light yellow
Streak:	White to Pale yellow
Luster:	Subadamantine
Diaphaneity:	Transparent to Translucent
Pleochroism:	None
Ultra Violet     Fluorescence:	Non-fluorescent
Magnetism:	Non-magnetic
Occurance:
Associated     Minerals:	Anglesite, Autunite, Barite, Becquerelite, Calcite, Cerussite, Chalcopyrite, Curite, Dewindtite, Fluorapatite, Fluorite, Fourmarierite, Galena, 'Gummite', Hematite, Ianthinite, Johannite, Kasolite, 'Limonite', Malachite, Meta-Autunite, Metatorbernite, Muscovite, Opal, Phosphuranylite, Pyrite, Pyromorphite, Quartz, Quartz var: Smoky Quartz, Schoepite, Siderite, Sphalerite, Torbernite, Uraninite, Uranocircite, Uranophane, Uranophane-beta, Uranopilite, Wolsendorfite Mineral   -   > 56% of sites Mineral   -   > 33% of sites Mineral   -   > 19% of sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Parsonsite
Locations:	Rare Parsonsite Locations
Notes:	Radioactive a- and b-particles, g-rays. Crystals may be metamict.