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

Environment:

Partially absorbed inclusions of wall-rock in a dikelike zone of carbonate rock cutting nepheline syenite.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Sudbury, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for CERium in its composition, and by analogy to thorianite and uraninite.

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

Diaphaneity:

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:

Bulk Density (Electron Density)=6.84 gm/cc
note: Specific Gravity of Cerianite-(Ce) =8.14 gm/cc.

Fermion Index:

Fermion Index = 0.0000790254
Boson Index = 0.9999209746

Photoelectric:

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

Radioactivity:

GRapi = 533,226.22 (Gamma Ray American Petroleum Institute Units)
Concentration of Cerianite-(Ce) per GRapi unit =1,875.38 (PPB)

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	13,320,856	3.60E-04	533,226.22	175.31
100 gm / 2.86 cm	1,332,086	3.60E-05	53,322.62	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:

04.04.12.01 (04)Simple Oxides

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

(04.04.12)Dana Group

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

Strunz Class:

04.DL.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DL -With large (± medium-sized) cations; fluorite-type structures

04.DL.05 Cerianite-(Ce) (Ce,Th)O2 F m3m 4/m 3 2/m

04.DL.05 Zirkelite (Ca,Th,Ce)Zr(Ti,Nb)2O7 F m3m 4/m 3 2/m

04.DL.05 Thorianite ThO2 F m3m 4/m 3 2/m

04.DL.05 Uraninite UO2 F m3m 4/m 3 2/m

Other Cerianite-(Ce) Information

References:

NAME( AntBidBlaNic3) 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 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals
14 - WWW-MINCRYST

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Cerianite-(Ce)

(Ce++++,Th)O2
Dana No: 04.04.12.01 Strunz No: 04.DL.05
Locality:

Notes: