Cebaite-(Ce) Mineral Data

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General Cebaite-(Ce) Information

Chemical Formula:

Ba3Ce2(CO3)5F2

Composition:

Molecular Weight = 1,030.25 gm

Barium 39.99 % Ba 44.65 % BaO

Cerium 27.20 % Ce 31.86 % Ce₂O₃

Carbon 5.83 % C 21.36 % CO₂

Oxygen 23.29 % O

Fluorine 3.69 % F 3.69 % F

- % F -1.55 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba₃Ce₂(CO₃)₅F₂

Environment:

Fe-Nb rare-earth deposit.

IMA Status:

Approved IMA 1973

Locality:

East mine, Bayan Obo, Inner Mongolia, China. Link to MinDat.org Location Data.

Name Origin:

Named after the composition.

Synonym:

ICSD 81121

PDF 43-691

Cebaite-(Ce) Image

Images:

Cebaite-(Ce)

Comments: Gemmy yellow to orange-yellow massive cebaite-(Ce); some cleavage evident, associated with green aegirine.
Location: Baiyun-Obo mine, Inner Mongolia, China. Scale: See Image.
© Rruff Database

Cebaite-(Ce) Crystallography

Axial Ratios:

a:b:c =4.2555:1:2.6295

Cell Dimensions:

a = 21.4256, b = 5.0348, c = 13.2395, Z = 4; beta = 91.613° V = 1,427.63 Den(Calc)= 4.79

Crystal System:

MonoclinicSpace Group: C 2/m or C 2

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

By Intensity(I/I_o): 3.25(1), 1.99(0.9), 3.98(0.8),

Crystal Structure:

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Yang Z , Neues Jahrbuch fur Mineralogie, Monatshefte , 1995 (1995) p.56-64, Structure redetermination of natural cebaite-(Ce), Ba3Ce2(CO3)5F2, Locality: Bayan Obo REE-Nb-Fe deposit, Inner Mongolia, China

Physical Properties of Cebaite-(Ce)

Cleavage:

{301} Indistinct

Color:

Gray white, Orange.

Density:

4.81

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Hardness:

4.5-5 - Near Apatite

Luster:

Vitreous - Waxy

Streak:

gray white

Optical Properties of Cebaite-(Ce)

Gladstone-Dale:

CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1447,KPDmeas= 0.1441,KC= 0.1498
Ncalc = 1.72

Optical Data:

Biaxial (-), a=1.598-1.604, b=1.735, g=1.74-1.748, bire=0.1420-0.1440, 2V(Calc)=20-32, 2V(Meas)=5.

Calculated Properties of Cebaite-(Ce)

Electron Density:

Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Cebaite-(Ce) =4.79 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Cebaite-(Ce)= 325.88 barns/electron
U=PE_Cebaite-(Ce) x r_electron=1,369.67 barns/cc.

Radioactivity:

GRapi = 25,457.94 (Gamma Ray American Petroleum Institute Units)
Concentration of Cebaite-(Ce) per GRapi unit = 39.28 (PPM)

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

**Estimated Radioactivity from Cebaite-(Ce)** - weak
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 / 7.36 cm	609,282	1.65E-05	25,457.94	8.37
100 gm / 3.42 cm	60,928	1.65E-06	2,545.79	0.84
10 gm / 1.59 cm	6,093	1.65E-07	254.58	0.08
1 gm / 7.36 mm	609	1.65E-08	25.46	0.01
0.1 gm / 3.42 mm	61	1.65E-09	2.55	0.00
0.01 gm / 1.59 mm	6	1.65E-10	0.25	0.00
0.001 gm / 0.74 mm	1	1.65E-11	0.03	0.00

Weight of pure Cebaite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.79 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 ( 1.36 % Th) From Sum REE Elements (27.20 % REE)

Cebaite-(Ce) Classification

Dana Class:

16a.01.09.01 (16a)Carbonates - Hydroxyl or Halogen

(16a.01)in the Bastnasite/Shynchysite/Parasite Groups

(16a.01.09)Dana Group

16a.01.09.01 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono

16a.01.09.02 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono

Strunz Class:

05.BD.15 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BD -With rare-earth elements (REE)

05.BD.15 Cebaite-(Nd)! Ba3(Nd,Ce)2(CO3)5F2 Unk Mono

05.BD.15 Cebaite-(Ce) Ba3Ce2(CO3)5F2 C 2/m or C 2 Mono

Other Cebaite-(Ce) Information

References:

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

See Also:

Links to other databases for Cebaite-(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 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Cebaite-(Ce)

Ba3Ce2(CO3)5F2
Dana No: 16a.01.09.01 Strunz No: 05.BD.15
Locality:

Notes: