Cerite-(Ce) Mineral Data


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General Cerite-(Ce) Information
Help on Chemical Formula: Chemical Formula: Ce+++9Fe+++(SiO4)6[(SiO3)(OH)](OH)3
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Ce9Fe3+(SiO4)6(SiO3)(OH)4
Help on Environment: Environment: Rare-earth ore deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1803
Help on Locality: Locality: Bastnaes mine near Riddarhyttan, Vastmanland, Seden. Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 31226
  PDF 11-126
 

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Cerite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:3.53103
Help on Cell Dimensions: Cell Dimensions: a = 10.779, c = 38.061, Z = 6; V = 3,829.73 Den(Calc)= 5.24
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.95(1), 1.954(0.5), 3.47(0.42),
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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)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Clove brown, Cherry red, Gray.
Help on Density: Density: 4.86
Help on Diaphaniety: Diaphaniety: Subtranslucent to opaque
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous - Adamantine
 

Optical Properties of Cerite-(Ce)

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=1.806-1.81, e=1.81-1.82, bire=0.0040-0.0100.
 

Calculated Properties of Cerite-(Ce)

Help on Electron Density: Electron Density:

relectron=4.34 gm/cc
note: rCerite-(Ce) =4.86 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00526
Boson Index = 0.99474
Help on Photoelectric: Photoelectric:

PECerite-(Ce) = 325.48 barns/electron
U=PECerite-(Ce) x relectron=1,410.98 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cerite-(Ce) :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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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:

 
 
   
 
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