Cerianite-(Ce) Mineral Data

Cerianite-(Ce) Mineral Data

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General Cerianite-(Ce) Information

Chemical Formula:

(Ce++++,Th)O2

Composition:

Molecular Weight = 195.09 gm

Cerium 53.86 % Ce 63.09 % Ce₂O₃

Thorium 29.73 % Th 33.83 % ThO₂

Oxygen 16.40 % O

______ ______

100.00 % 96.92 % = TOTAL OXIDE

Empirical Formula:

Ce_0.75Th_0.25O₂

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 72155

PDF 43-1002

Cerianite-(Ce) Image

Images:

Cerianite-(Ce)

Comments: Black crystal of cerianite-(Ce) on matrix.
Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Cerianite-(Ce) Crystallography

Cell Dimensions:

a = 5.42, Z = 4; V = 159.22 Den(Calc)= 8.14

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F m3m

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

By Intensity(I/I_o): 3.124(1), 1.913(0.51), 1.632(0.44),

Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Fluorite structure

Physical Properties of Cerianite-(Ce)

Color:

Greenish yellow, Resin brown, Dark greenish brown.

Density:

7.216

Diaphaniety:

Translucent

Optical Properties of Cerianite-(Ce)

Optical Data:

NCalc= 2.2 - from Gladstone-Dale relationship (KC = 0.1474) where Ncalc=Dcalc*KC+1
NCalc= 2.06 - from Gladstone-Dale relationship (KC = 0.1474) where Ncalc=Dmeas*KC+1

Calculated Properties of Cerianite-(Ce)

Electron Density:

r_electron=6.84 gm/cc
note: r_{Cerianite-(Ce)}=8.14 gm/cc.

Fermion Index

Fermion Index = 0.00007
Boson Index = 0.99993

Photoelectric:

PE_{Cerianite-(Ce)}=1,039.87 barns/electron
U=PE_{Cerianite-(Ce)} x r_electron=7,115.47 barns/cc.

Radioactivity:

GRapi = 533,226.08 (Gamma Ray American Petroleum Institute Units)

Cerianite-(Ce) 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) 57.04 ± 14.26 grams of pure Cerianite-(Ce) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5704.3 ±1426.1 grams of pure Cerianite-(Ce) .

**Estimated Radioactivity from Cerianite-(Ce)** - 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 / 6.17 cm	13,320,854	3.60E-04	533,226.08	175.31
100 gm / 2.86 cm	1,332,085	3.60E-05	53,322.61	17.53
10 gm / 1.33 cm	133,209	3.60E-06	5,332.26	1.75
1 gm / 6.17 mm	13,321	3.60E-07	533.23	0.18
0.1 gm / 2.86 mm	1,332	3.60E-08	53.32	0.02
0.01 gm / 1.33 mm	133	3.60E-09	5.33	0.00
0.001 gm / 0.62 mm	13	3.60E-10	0.53	0.00

Weight of pure Cerianite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 8.14 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

Cerianite-(Ce) Classification

Dana Class:

4.4.12.1 (4)Simple Oxides

(4.4)with a cation charge of 4+ (A++++ O2)

(4.4.12)Dana Group

4.4.12.1 Cerianite-(Ce) (Ce,Th)O2 F m3m 4/m 3 2/m

Strunz Class:

IV/D.31-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.31 - Badleyite - Uraninite series

IV/D.31-10 Baddeleyite ZrO2 P 2₁/c 2/m

IV/D.31-20 Tazheranite CaTiZr2O8 F m3m 4/m 3 2/m

IV/D.31-30 Calzirtite CaZr3TiO9 P bca 2/m 2/m 2/m

IV/D.31-35 Hiarneite! (Ca,Mn,Na)2(Zr,Mn)5(Sb,Ti,Fe)2O16 I 4₁/acd 4/m 2/m 2/m

IV/D.31-40 Cerianite-(Ce) (Ce,Th)O2 F m3m 4/m 3 2/m

IV/D.31-50 Thorianite ThO2 F m3m 4/m 3 2/m

IV/D.31-60 Uraninite UO2 F m3m 4/m 3 2/m

Other Cerianite-(Ce) Information

References:

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

See Also:

Links to other databases for Cerianite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Cerianite-(Ce)

(Ce++++,Th)O2
Dana No: 4.4.12.1 Strunz No: IV/D.31-40
Locality:

Notes: