Vochtenite	IMA-A 1987-047
Uranium	42.11.23.1 (Dana Classification Number)
(No Images)	7/E.06-10 (Strunz ID)

Property	Data	Remarks
Named for:	Renard F. C. Vochten (1933-), mineraloigst, State University of Antwerp, Antwerp, Belgium
Alternate     Name(s):
Mineral Class:	Phosphates, Arsenates, Vanadates - - Vochtenite - Xiangjianite series
Chemical     Formula:	(Fe+2,Mg)Fe+3[(UO2)(PO4)]4(OH) · 12-13H2O
Chemical     Composition:	Hydrogen: (H) 1.45% Iron: (Fe) 5.41% Magnesium: (Mg) 0.34% Oxygen: (O) 33.22% Phosphorus: (P) 6.86% Uranium: (U) 52.72%	by weight
Molecular     Weight:	1,806.00	daltons (amu)
Specific     Radioactivity:	(All radiation is for a 1 gram, fully aged specimen) Specific Activity Dose Rate Becquerels Curies milliRems/hour microSieverts/hour 9.4368 × 1004 2.55 × 10-06 1.31 131.30 Estimated Average Annual Exposure: 360 mRem (3.6 milliSieverts)
Crystalography:	System: Monoclinic Axial Ratios: a:b:c = 0.6306:1:0.4997 Cell Dimensions: a = 12.606, b = 19.99, c = 9.99, Z = 3; beta = 102.52° V = 2,457.56 Den(Calc) = 3.66 H-M Symbol: Space Group: X Ray Diffraction: By Intensity(I/Io): 9.998(1) 3.475(0.7) 3.333(0.5)
Habit:	Aggregates
Cleavage:	[001] [010] Distinct [100]
Fracture:
Moh's     Hardness:	2.5 - 3
Density:	3.65	grams/cm3
Color:	Bronze-brown
Streak:	Light brown
Luster:	Adamantine - Metallic
Diaphaneity:	Translucent to Opaque
Pleochroism:	(x): (y:) (z:)
Ultra Violet     Fluorescence:	Non-fluorescent
Magnetism:	Non-magnetic
Occurance:
Associated     Minerals:	Annabergite, Beyerite, Billietite, Bismuth, Bismuthinite, Bismutite, Dewindtite, Erythrite, Eulytine, Galena, 'Ganomatite', Geminite, Gypsum, Johannite, Kasolite, Kettnerite, Köttigite, Lavendulan, Liebigite, Lindackerite, Metaschoepite, Metazellerite, Namibite, Olivenite, 'Pitticite', Pucherite, Schröckingerite, Sodium-Zippeite, Sphalerite, Strashimirite, Uraninite, Uranopilite, Wurtzite, Zellerite, Zippeite Mineral   -   both of the sites Minerals   -   Uranium & Thorium mineral links	These are minerals known to be found with Vochtenite
Locations:	Extremely rare Vochtenite Locations
Notes:	Strongly radioactive a- and b-particles, g-rays. Crystals are probably metamic.