Wakefieldite-(La) Mineral Data

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General Wakefieldite-(La) Information

Chemical Formula:

LaVO4

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

Empirical Formula:

La_0.71Nd_0.15Pr_0.11Sm_0.01Y_0.01V⁵⁺_1.01O₄

Environment:

Xenotime group

IMA Status:

Approved IMA 2007 (Dana # Added)

Locality:

Glücksstern mine, Gottlob Hill, Friedrichroda, Thüringen, Germany Link to MinDat.org Location Data.

Name Origin:

Named as the La analog of wakefieldite-(Ce) and -(Y).

Name Pronunciation:

Wakefieldite-(La) + Pronunciation

Synonym:

IMA1989-035a

Wakefieldite-(La) Image

Images:

Wakefieldite-(La)

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

Axial Ratios:

a:c = 1:0.8782

Cell Dimensions:

a = 7.406, c = 6.504, Z = 4; V = 356.74 Den(Calc)= 4.72

Crystal System:

Tetragonal - Ditetragonal PyramidalH-M Symbol (4mm) Space Group: I 4₁/amd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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)

Cleavage:

{???} Poor

Color:

Light pink, Brown.

Diaphaneity:

Transparent to translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

white

Optical Properties of Wakefieldite-(La)

Gladstone-Dale:

CI calc= 0.117 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1907,KC= 0.216
Ncalc = 2.02

Optical Data:

Uniaxial (+), w=1.9, e=1.9, bire=0.0000.

Calculated Properties of Wakefieldite-(La)

Electron Density:

Bulk Density (Electron Density)=4.18 gm/cc
note: Specific Gravity of Wakefieldite-(La) =4.72 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Wakefieldite-(La)}= 282.37 barns/electron
U=PE_{Wakefieldite-(La)} x r_electron=1,179.31 barns/cc.

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
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr 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

Dana Class:

38.04.11.07 (38)Anhydrous Phosphates, etc

(38.04)A+ XO4

(38.04.11)Zenotime Group (Tetragonal: I41/amd)

38.04.11.01 Xenotime-(Y) YPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.02 Chernovite-(Y) YAsO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.03 Wakefieldite-(Y) YVO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.04 Wakefieldite-(Ce) (Ce,Pb,Pb)VO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.05 Pretulite! ScPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.06 Xenotime-(Yb)! YbPO4 I 4₁/amd 4/m 2/m 2/m

38.04.11.07 Wakefieldite-(La)! LaVO4 I 4₁/amd 4mm

38.04.11.08 Wakefieldite-(Nd)! NdVO4 I 4₁/amd 4mm

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

References:

NAME( AmMin, v94:649) PHYS. PROP.(AmMin, v94:649) OPTIC PROP.(AmMin, v94:649)

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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Print or Cut-and-Paste your Wakefieldite-(La) Specimen Label here :

Wakefieldite-(La)

LaVO4
Dana No: 38.04.11.07 Strunz No: 08.AD.35
Locality:

Notes: