Lepersonnite-(Gd) Mineral Data

Lepersonnite-(Gd) Mineral Data +

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General Lepersonnite-(Gd) Information

Chemical Formula:

CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O)

Composition:

Molecular Weight = 8,548.38 gm

Calcium 0.47 % Ca 0.66 % CaO

Gadolinium 3.68 % Gd 4.24 % Gd₂O₃

Uranium 66.83 % U 75.81 % UO₂

Silicon 1.31 % Si 2.81 % SiO₂

Hydrogen 1.13 % H 10.12 % H₂O

Carbon 1.12 % C 4.12 % CO₂

Oxygen 25.45 % O

______ ______

100.00 % 97.75 % = TOTAL OXIDE

Empirical Formula:

CaGd₂(UO₂)₂₄(CO₃)₈(SiO₄)₄·48(H₂O)

Environment:

In a black crust in the lower portion of the oxidation zone.

IMA Status:

Approved IMA 1982

Locality:

Shinkolobwe, Shaba, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named after Jacques Lepersonne (1909-), honorary head of the Department of Geology and Mineralogy, Musee Royale de l'Afrique Centrale, Brussels, Belgium.

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Lepersonnite-(Gd) Crystallography

Axial Ratios:

a:b:c =0.4185:1:0.3024

Cell Dimensions:

a = 16.23, b = 38.78, c = 11.73, Z = 2; V = 7,382.85 Den(Calc)= 3.85

Crystal System:

OrthorhombicSpace Group: Pnnm,Pnn2

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

By Intensity(I/I_o): 8.15(1), 3(0.8), 4.04(0.7),

Physical Properties of Lepersonnite-(Gd)

Cleavage:

[1] Good

Color:

Bright yellow.

Density:

3.97

Diaphaniety:

Transparent to Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Spherical - Spherical, rounded aggregates.

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Lepersonnite-(Gd)

Gladstone-Dale:

CI meas= -0.27 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.309 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1719,KPDmeas= 0.1668,KC= 0.1313

Optical Data:

Biaxial (-), a=1.638, b=1.666, g=1.682, bire=0.0440, 2V(Calc)=72, 2V(Meas)=73.

Pleochroism (x):

pale yellow.

Pleochroism (y):

bright yellow.

Pleochroism (z):

bright yellow.

Calculated Properties of Lepersonnite-(Gd)

Electron Density:

r_electron=3.38 gm/cc
note: r_{Lepersonnite-(Gd)}=3.97 gm/cc.

Fermion Index

Fermion Index = 0.03119
Boson Index = 0.96881

Photoelectric:

PE_{Lepersonnite-(Gd)}=1,806.43 barns/electron
U=PE_{Lepersonnite-(Gd)} x r_electron=6,114.16 barns/cc.

Radioactivity:

GRapi = 4,859,750.90 (Gamma Ray American Petroleum Institute Units)

Lepersonnite-(Gd) 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) 6.26 ± 1.56 grams of pure Lepersonnite-(Gd) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 625.89 ±156.47 grams of pure Lepersonnite-(Gd) .

**Estimated Radioactivity from Lepersonnite-(Gd)** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 7.84 cm	119,704,119	3.24E-03	4,859,750.90	1,597.73
100 gm / 3.64 cm	11,970,412	3.24E-04	485,975.09	159.77
10 gm / 1.69 cm	1,197,041	3.24E-05	48,597.51	15.98
1 gm / 7.84 mm	119,704	3.24E-06	4,859.75	1.60
0.1 gm / 3.64 mm	11,970	3.24E-07	485.98	0.16
0.01 gm / 1.69 mm	1,197	3.24E-08	48.60	0.02
0.001 gm / 0.78 mm	120	3.24E-09	4.86	0.00

Weight of pure Lepersonnite-(Gd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.97 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 ( 0.18 % Th) From Sum REE Elements ( 3.68 % REE)

Lepersonnite-(Gd) Classification

Dana Class:

17.1.12.1 (17)Compound Carbonates

(17.1)with miscellaneous formulae

(17.1.12)Dana Group

17.1.12.1 Lepersonnite-(Gd) CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O) Pnnm,Pnn2 Ortho

Strunz Class:

VIII/B.38-10 VIII - Silicates

VIII/B - Nesosub-silicates. "Insel" silicates with anions unfamiliar to tetraheders. Uranyl-"Insel" silicates with [UO2]2+ - [SiO4]4-

VIII/B.38 - Lepersonnite-(Gd) series

VIII/B.38-10 Lepersonnite-(Gd) CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O) Pnnm,Pnn2 Ortho

Other Lepersonnite-(Gd) Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Lepersonnite-(Gd) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Lepersonnite-(Gd)

CaGd2(UO2)24(CO3)8(SiO4)4·48(H2O)
Dana No: 17.1.12.1 Strunz No: VIII/B.38-10
Locality:

Notes: