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Gadolinite-(Ce) Mineral Data

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General Gadolinite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,La,Nd,Y)2Fe++Be2Si2O10
Help on Composition: Composition: Molecular Weight = 571.37 gm
   Lanthanum        10.94 %  La   12.83 % La2O3
   Cerium           16.68 %  Ce   19.53 % Ce2O3
   La,Ce,Pr,Nd,Sm,  17.89 %  RE   20.88 % REE2O3
   Yttrium           4.98 %  Y     6.32 % Y2O3
   Magnesium         0.17 %  Mg    0.28 % MgO
   Titanium          0.08 %  Ti    0.14 % TiO2
   Manganese         0.96 %  Mn    1.24 % MnO
   Beryllium         2.93 %  Be    8.14 % BeO
   Aluminum          0.05 %  Al    0.09 % Al2O3
   Iron              7.23 %  Fe    9.31 % FeO
   Silicon           9.93 %  Si   21.24 % SiO2
   Boron             0.15 %  B     0.49 % B2O3
   Oxygen           28.00 %  O
                   ______        ______ 
                   100.00 %      100.49 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.68La0.45Y0.32REE0.71Fe2+0.74Mn2+0.1Mg0.04Ti0.01Be1.86B0.08Al0.01Si2.02O10
Help on Environment: Environment: In syenite pegmatite veins along a contact between basalt and monzonite.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: From a dump at Buer, nine km southeast of Skien, Bjorkendalen region, and in the Bakken quarry, Tvedalen, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its cerium content and the relationship to gadolinite-(Y).
Help on Name Pronunciation: Name Pronunciation: Gadolinite-(Ce) + Pronunciation Say GADOLINITE-(CE)
 

Gadolinite-(Ce) Image

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  Gadolinite-(Ce)

Comments: Sharp, well crystallized single crystal of brown gadolinite.
Location: Buer, Bjørkedalen, Porsgrunn, Telemark, Norway. Scale: 18x14x8 mm.
© John Betts - Fine Minerals

Gadolinite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6358:1:1.3205
Help on Cell Dimensions: Cell Dimensions: a = 4.82, b = 7.58, c = 10.01, Z = 2; beta = 90.47° V = 365.71 Den(Calc)= 5.19
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.88(1), 4.81(0.9), 2.6(0.8),
 

Physical Properties of Gadolinite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 4.2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: greenish gray
 

Optical Properties of Gadolinite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.086 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.122 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1503,KPDmeas= 0.1857,KC= 0.1711
Ncalc = 1.72 - 1.89
Help on Optical Data: Optical Data: Isotropic, n=1.78.
 

Calculated Properties of Gadolinite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.82 gm/cc
note: Specific Gravity of Gadolinite-(Ce) =4.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEGadolinite-(Ce) = 257.52 barns/electron
U=PEGadolinite-(Ce) x relectron= 982.71 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 44,167.77 (Gamma Ray American Petroleum Institute Units)
Concentration of Gadolinite-(Ce) per GRapi unit = 22.64 (PPM)

Gadolinite-(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) 688.66 ±172.17 grams of pure Gadolinite-(Ce) .

Estimated Radioactivity from Gadolinite-(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 / 7.69 cm 1,020,842 2.76E-05 44,167.77 14.52
100 gm / 3.57 cm 102,084 2.76E-06 4,416.78 1.45
10 gm / 1.66 cm 10,208 2.76E-07 441.68 0.15
1 gm / 7.69 mm 1,021 2.76E-08 44.17 0.01
0.1 gm / 3.57 mm 102 2.76E-09 4.42 0.00
0.01 gm / 1.66 mm 10 2.76E-10 0.44 0.00
0.001 gm / 0.77 mm 1 2.76E-11 0.04 0.00

Weight of pure Gadolinite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.20 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 ( 2.28 % Th) From Sum REE Elements (45.51 % REE)
 

Gadolinite-(Ce) Classification

Help on  Dana Class: Dana Class: 54.02.01b.02 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.01b)Datolite group (Homilite series)
 
54.02.01b.01 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 21/c 2/m
 
54.02.01b.02 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m
 
54.02.01b.03 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m
 
54.02.01b.04 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 21/a 2/m
 
54.02.01b.05 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m
 
54.02.01b.06 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.AJ.20 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
 
09.AJ.20 Bakerite Ca4B4(BO4)(SiO4)3(OH)3•(H2O) P 21/c 2/m
 
09.AJ.20 Calcybeborosilite-(Y)! (REE,Ca)2[](B,Be)2(SiO4)2(OH,O)2 P 21/a 2/m
 
09.AJ.20 Calciogadolinite? CaREE(Fe)Be2Si2O10 P 21/a 2/m
 
09.AJ.20 Datolite CaBSiO4(OH) P 21/c 2/m
 
09.AJ.20 Hingganite-(Yb) (Yb,Y)2([])Be2Si2O8(OH)2 P 21/a 2/m
 
09.AJ.20 Homilite Ca2(Fe,Mg)B2Si2O10 P 21/a 2/m
 
09.AJ.20 Gadolinite-(Ce) (Ce,La,Nd,Y)2FeBe2Si2O10 P 21/c 2/m
 
09.AJ.20 Gadolinite-(Y) Y2FeBe2Si2O10 P 21/a 2/m
 
09.AJ.20 Hingganite-(Ce) (Ce,Ca)2([],Fe)Be2Si2O8[(OH),O]2 P 21/a 2/m
 
09.AJ.20 Hingganite-(Y) Y2([])Be2Si2O8(OH)2 P 21/a 2/m
 
09.AJ.20 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)•n(H2O)(?) Unk (HEX-R) Trig
 
09.AJ.20 Minasgeraisite-(Y) CaY2Be2Si2O10 P 21/a 2/m
 

Other Gadolinite-(Ce) Information

Help on References: References: NAME( AntBidBlaNic2) 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 Gadolinite-(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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Print or Cut-and-Paste your Gadolinite-(Ce) Specimen Label here :

Gadolinite-(Ce)

(Ce,La,Nd,Y)2Fe++Be2Si2O10
Dana No: 54.02.01b.02 Strunz No: 09.AJ.20
Locality:

 

Notes:

 

 
   
 


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