Wakefieldite-(Ce) Mineral Data

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General Wakefieldite-(Ce) Information

Chemical Formula:

(Ce+++,Pb++,Pb++++)VO4

Composition:

Molecular Weight = 281.89 gm

Cerium 29.82 % Ce 34.93 % Ce₂O₃

Vanadium 18.07 % V 32.26 % V₂O₅

Lead 29.40 % Pb 23.75 % PbO / 8.49 % PbO₂

Oxygen 22.70 % O

______ ______

100.00 % 99.43 % = TOTAL OXIDE

Empirical Formula:

Ce_0.6Pb_0.3Pb_0.1(VO₄)

Environment:

Found in the oxidation zone.

IMA Status:

Approved IMA 1977

Locality:

Kusu deposit, 85 km SW of Kinshasa, Zaire. Link to MinDat.org Location Data.

Name Origin:

Renamed from kusuite in 1977 for the locality, changed to wakefieldite-Ce as the Ce analog of wakefieldite-Y.

Name Pronunciation:

Wakefieldite-(Ce) + Pronunciation

Synonym:

ICSD 202425

IMA1989-035

Kusuite

PDF 29-398

Wakefieldite-(Ce) Image

Images:

Wakefieldite-(Ce)

Comments: Bluish black crystal of wakefieldite-(Ce) on matrix.
Location: Yellow Lake, Olala, British Columbia, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Wakefieldite-(Ce) Crystallography

Axial Ratios:

a:c = 1:0.88224

Cell Dimensions:

a = 7.354, c = 6.488, Z = 4; V = 350.88 Den(Calc)= 5.34

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

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

By Intensity(I/I_o): 3.678(1), 2.766(0.9), 1.891(0.7),

Crystal Structure:

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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
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Baudracco-Gritti C , Quartieri S , Vezzalini G , Permingeat F , Pillard F , Rinaldi R , Bulletin de Mineralogie , 110 (1987) p.657-663, Une wakefieldite-(Ce) non plombifere: nouvelles donnees sur, l espece minerale correspondant a l orthovanadate de cerium

View Additional jPOWD Structure files for Wakefieldite-(Ce)
[1]

Physical Properties of Wakefieldite-(Ce)

Cleavage:

None

Color:

Dark red, Black.

Density:

4.76

Diaphaneity:

Translucent

Habit:

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

Habit:

Square - Occurs as square crystals in shape or outline.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

rusty brown

Optical Properties of Wakefieldite-(Ce)

Dichroism (w):

yellow.

Gladstone-Dale:

CI meas= -0.048 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.066 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1873,KPDmeas= 0.2101,KC= 0.2005
Ncalc = 1.95 - 2.07

Optical Data:

Uniaxial (?), b=2.

Calculated Properties of Wakefieldite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.14 gm/cc
note: Specific Gravity of Wakefieldite-(Ce) =4.76 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Wakefieldite-(Ce)}= 680.98 barns/electron
U=PE_{Wakefieldite-(Ce)} x r_electron=2,819.60 barns/cc.

Radioactivity:

GRapi = 27,671.42 (Gamma Ray American Petroleum Institute Units)
Concentration of Wakefieldite-(Ce) per GRapi unit = 36.14 (PPM)

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

**Estimated Radioactivity from Wakefieldite-(Ce)** - 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 / 7.38 cm	668,047	1.81E-05	27,671.42	9.10
100 gm / 3.42 cm	66,805	1.81E-06	2,767.14	0.91
10 gm / 1.59 cm	6,680	1.81E-07	276.71	0.09
1 gm / 7.38 mm	668	1.81E-08	27.67	0.01
0.1 gm / 3.42 mm	67	1.81E-09	2.77	0.00
0.01 gm / 1.59 mm	7	1.81E-10	0.28	0.00
0.001 gm / 0.74 mm	1	1.81E-11	0.03	0.00

Weight of pure Wakefieldite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.76 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 ( 1.49 % Th) From Sum REE Elements (29.82 % REE)

Wakefieldite-(Ce) Classification

Dana Class:

38.04.11.04 (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-(Ce) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Wakefieldite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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

Wakefieldite-(Ce)

(Ce+++,Pb++,Pb++++)VO4
Dana No: 38.04.11.04 Strunz No: 08.AD.35
Locality:

Notes: