Cerite-(Ce) Mineral Data

Cerite-(Ce) Mineral Data

General Cerite-(Ce) Information

Chemical Formula:

Ce+++9Fe+++(SiO4)6[(SiO3)(OH)](OH)3

Composition:

Molecular Weight = 2,013.49 gm

Cerium 62.63 % Ce 73.36 % Ce₂O₃

Iron 2.77 % Fe 3.97 % Fe₂O₃

Silicon 9.76 % Si 20.89 % SiO₂

Hydrogen 0.20 % H 1.79 % H₂O

Oxygen 24.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ce₉Fe³⁺(SiO₄)₆(SiO₃)(OH)₄

Environment:

Rare-earth ore deposits.

IMA Status:

Valid Species (Pre-IMA) 1803

Locality:

Bastnaes mine near Riddarhyttan, Vastmanland, Seden. Link to MinDat.org Location Data.

Synonym:

ICSD 31226

PDF 11-126

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Cerite-(Ce) Crystallography

Axial Ratios:

a:c = 1:3.53103

Cell Dimensions:

a = 10.779, c = 38.061, Z = 6; V = 3,829.73 Den(Calc)= 5.24

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c

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

By Intensity(I/I_o): 2.95(1), 1.954(0.5), 3.47(0.42),

Crystal Structure:

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Moore P B , Shen J , American Mineralogist , 68 (1983) p.996-1003, Cerite, RE9(Fe3+,Mg)(SiO4)6(SiO3OH)(OH)3: Its crystal structure and, relation to whitlockite, Note: Thermal parameters have been changed to match symmetry constraints,, It is likely that the structure was refined wrong to begin with.

Physical Properties of Cerite-(Ce)

Cleavage:

None

Color:

Brown, Clove brown, Cherry red, Gray.

Density:

4.86

Diaphaniety:

Subtranslucent to opaque

Fracture:

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

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5.5 - Knife Blade

Luster:

Vitreous - Adamantine

Optical Properties of Cerite-(Ce)

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1549,KPDmeas= 0.167,KC= 0.1677

Optical Data:

Uniaxial (+), w=1.806-1.81, e=1.81-1.82, bire=0.0040-0.0100.

Calculated Properties of Cerite-(Ce)

Electron Density:

r_electron=4.34 gm/cc
note: r_Cerite-(Ce)=4.86 gm/cc.

Fermion Index

Fermion Index = 0.00526
Boson Index = 0.99474

Photoelectric:

PE_Cerite-(Ce)= 325.48 barns/electron
U=PE_Cerite-(Ce) x r_electron=1,410.98 barns/cc.

Radioactivity:

GRapi = 59,588.36 (Gamma Ray American Petroleum Institute Units)

Cerite-(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) 510.45 ±127.61 grams of pure Cerite-(Ce) .

**Estimated Radioactivity from Cerite-(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 / 7.32 cm	1,402,894	3.79E-05	59,588.36	19.59
100 gm / 3.40 cm	140,289	3.79E-06	5,958.84	1.96
10 gm / 1.58 cm	14,029	3.79E-07	595.88	0.20
1 gm / 7.32 mm	1,403	3.79E-08	59.59	0.02
0.1 gm / 3.40 mm	140	3.79E-09	5.96	0.00
0.01 gm / 1.58 mm	14	3.79E-10	0.60	0.00
0.001 gm / 0.73 mm	1	3.79E-11	0.06	0.00

Weight of pure Cerite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.86 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 ( 3.13 % Th) From Sum REE Elements (62.63 % REE)

Cerite-(Ce) Classification

Dana Class:

52.4.6.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.6)Dana Group

52.4.6.1 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

52.4.6.2 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

Strunz Class:

VIII/B.19-40 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.19 - Kuliokite-(Y) - Cerite-(Ce) series

VIII/B.19-10 Kuliokite-(Y) (Y,REE)4Al(SiO4)2(OH)2F5 P1 1

VIII/B.19-20 Tornebohmite-(Ce) (Ce,La,Nd)2Al(SiO4)2(OH) P 2₁/c 2/m

VIII/B.19-30 Tornebohmite-(La) (La,Ce)2Al(SiO4)2(OH) P 2₁/c 2/m

VIII/B.19-40 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

VIII/B.19-50 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

Other Cerite-(Ce) Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Cerite-(Ce)

Ce+++9Fe+++(SiO4)6[(SiO3)(OH)](OH)3
Dana No: 52.4.6.1 Strunz No: VIII/B.19-40
Locality:

Notes: