Lepersonnite-(Gd) Mineral Data

General Lepersonnite-(Gd) Information

Chemical Formula:

CaGd2(UO3)24(CO3)8(SiO4)4O4•60(H2O)

Composition:

Molecular Weight = 8,909.01 gm

Calcium 0.32 % Ca 0.45 % CaO

Gadolinium 1.84 % Gd 2.12 % Gd₂O₃

Dysprosium 0.95 % Dy 1.09 % Dy₂O₃

Yttrium 0.32 % Y 0.41 % Y₂O₃

Terbium 0.11 % Tb 0.12 % Tb₂O₃

Uranium 63.99 % U 76.89 % UO₃

Silicon 1.32 % Si 2.82 % SiO₂

Hydrogen 1.36 % H 12.11 % H₂O

Carbon 1.09 % C 4.00 % CO₂

Oxygen 28.72 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Ca_0.71Gd_1.04Dy_0.52Y_0.32Tb_0.06U_23.95C_8.1Si_4.18O₁₀₀�59.9(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.

Name Pronunciation:

Lepersonnite-(Gd) + Pronunciation

Lepersonnite-(Gd) Crystallography

Axial Ratios:

a:b:c =0.4189:1:0.3027

Cell Dimensions:

a = 16.23, b = 38.74, c = 11.73, Z = 2; V = 7,375.24 Den(Calc)= 4.01

Crystal System:

Orthorhombic Space 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

Diaphaneity:

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 and radioactive.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Lepersonnite-(Gd)

Gladstone-Dale:

CI meas= -0.098 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.087 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1651,KPDmeas= 0.1668,KC= 0.1519
Ncalc = 1.6 - 1.61

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:

Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Lepersonnite-(Gd) =4.01 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Lepersonnite-(Gd)}=1,706.79 barns/electron
U=PE_{Lepersonnite-(Gd)} x r_electron=5,901.57 barns/cc.

Radioactivity:

GRapi = 4,705,731.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Lepersonnite-(Gd) per GRapi unit = 212.51 (PPB)

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) 6.46 ± 1.62 grams of pure Lepersonnite-(Gd) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 646.37 ±161.59 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 / 7.81 cm	114,605,128	3.10E-03	4,705,731.27	1,547.09
100 gm / 3.62 cm	11,460,513	3.10E-04	470,573.13	154.71
10 gm / 1.68 cm	1,146,051	3.10E-05	47,057.31	15.47
1 gm / 7.81 mm	114,605	3.10E-06	4,705.73	1.55
0.1 gm / 3.62 mm	11,461	3.10E-07	470.57	0.15
0.01 gm / 1.68 mm	1,146	3.10E-08	47.06	0.02
0.001 gm / 0.78 mm	115	3.10E-09	4.71	0.00

Weight of pure Lepersonnite-(Gd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.01 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 ( 0.14 % Th) From Sum REE Elements ( 2.89 % REE)

Lepersonnite-(Gd) Classification

Dana Class:

17.01.12.01 (17)Compound Carbonates

(17.01)with miscellaneous formulae

(17.01.12)Dana Group

17.01.12.01 Lepersonnite-(Gd) CaGd2(UO3)24(CO3)8(SiO4)4O4•60(H2O) Pnnm,Pnn2 Ortho

Strunz Class:

05.EG.10 05 - CARBONATES (NITRATES)

05.E - Uranyl Carbonates

05.EG -With SO4 or SiO4

05.EG.10 Lepersonnite-(Gd) CaGd2(UO3)24(CO3)8(SiO4)4O4•60(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 - 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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Lepersonnite-(Gd)

CaGd2(UO3)24(CO3)8(SiO4)4O4•60(H2O)
Dana No: 17.01.12.01 Strunz No: 05.EG.10
Locality:

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