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Wakefieldite-(La) Mineral Data

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General Wakefieldite-(La) Information

Help on Chemical  Formula: Chemical Formula: LaVO4
Help on Composition: Composition: Molecular Weight = 253.60 gm
   Lanthanum      38.89 %  La   45.61 % La2O3
   Praeseodymium   6.11 %  Pr    7.15 % Pr2O3
   Samarium        0.59 %  Sm    0.69 % Sm2O3
   Yttrium         0.35 %  Y     0.45 % Y2O3
   Vanadium       20.29 %  V    36.22 % V2O5
   Neodymium       8.53 %  Nd    9.95 % Nd2O3
   Oxygen         25.24 %  O
                 ______        ______ 
                 100.00 %      100.06 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La0.71Nd0.15Pr0.11Sm0.01Y0.01V5+1.01O4
Help on Environment: Environment: Xenotime group
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Gl�cksstern mine, Gottlob Hill, Friedrichroda, Th�ringen, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the La analog of wakefieldite-(Ce) and -(Y).
Help on Name Pronunciation: Name Pronunciation: Wakefieldite-(La) + Pronunciation Say WAKEFIELDITE-(LA)
Help on Synonym: Synonym: IMA1989-035a

Wakefieldite-(La) Image

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Comments: Pale pink prisimatic crystal (center of photo) of Wakefieldite-(La) in matrix.
Location: Grube Glücksstern, Berg Gottlob, Friedrichroda, Thüringen, Germany. Scale: Picture size 3 mm.
© Thomas Witzke

Wakefieldite-(La) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.8782
Help on Cell Dimensions: Cell Dimensions: a = 7.406, c = 6.504, Z = 4; V = 356.74 Den(Calc)= 4.72
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Pyramidal H-M Symbol (4mm) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.707(1), 2.623(0.7), 2.088(0.5),2.309(0.5), 2.939(0.5), 1.902(0.4), 1.853(0.19), 2.759(0.1),

Physical Properties of Wakefieldite-(La)

Help on Cleavage: Cleavage: {???} Poor
Help on Color: Color: Light pink, Brown.
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Wakefieldite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1907,KC= 0.216
Ncalc = 2.02
Help on Optical Data: Optical Data: Uniaxial (+), w=1.9, e=1.9, bire=0.0000.

Calculated Properties of Wakefieldite-(La)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Wakefieldite-(La) =4.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEWakefieldite-(La) = 282.37 barns/electron
U=PEWakefieldite-(La) x relectron=1,179.31 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 51,118.05 (Gamma Ray American Petroleum Institute Units)
Concentration of Wakefieldite-(La) per GRapi unit = 19.56 (PPM)

Wakefieldite-(La) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 595.03 ±148.76 grams of pure Wakefieldite-(La) .

Estimated Radioactivity from Wakefieldite-(La) - weak
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.40 cm 1,213,165 3.28E-05 51,118.05 16.81
100 gm / 3.43 cm 121,317 3.28E-06 5,111.81 1.68
10 gm / 1.59 cm 12,132 3.28E-07 511.18 0.17
1 gm / 7.40 mm 1,213 3.28E-08 51.12 0.02
0.1 gm / 3.43 mm 121 3.28E-09 5.11 0.00
0.01 gm / 1.59 mm 12 3.28E-10 0.51 0.00
0.001 gm / 0.74 mm 1 3.28E-11 0.05 0.00

Weight of pure Wakefieldite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.72 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 2.71 % Th) From Sum REE Elements (54.13 % REE)

Wakefieldite-(La) Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.11)Zenotime Group (Tetragonal: I41/amd) Xenotime-(Y) YPO4 I 41/amd 4/m 2/m 2/m Chernovite-(Y) YAsO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(Y) YVO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 41/amd 4/m 2/m 2/m Pretulite! ScPO4 I 41/amd 4/m 2/m 2/m Xenotime-(Yb)! YbPO4 I 41/amd 4/m 2/m 2/m Wakefieldite-(La)! LaVO4 I 41/amd 4mm Wakefieldite-(Nd)! NdVO4 I 41/amd 4mm
Help on  Strunz Class: Strunz Class: 08.AD.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
08.AD.35 Dreyerite BiVO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Chernovite-(Y) YAsO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Pretulite! ScPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Xenotime-(Y) YPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(Y) YVO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Xenotime-(Yb)! YbPO4 I 41/amd 4/m 2/m 2/m
08.AD.35 Wakefieldite-(La)! LaVO4 I 41/amd 4mm
08.AD.35 Wakefieldite-(Nd)! NdVO4 I 41/amd 4mm

Other Wakefieldite-(La) Information

Help on References: References: NAME( AmMin, v94:649) PHYS. PROP.(AmMin, v94:649) OPTIC PROP.(AmMin, v94:649)
Help on See Also: See Also: Links to other databases for Wakefieldite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.AD.35





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