Davidite-(Ce) Mineral Data + Say DAVIDITE-(CE)


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General Davidite-(Ce) Information
Help on Chemical Formula: Chemical Formula: (Ce,La)(Y,U)(Ti,Fe+++)20O38
Help on Composition: Composition: Molecular Weight = 1,871.41 gm
   Lanthanum   1.86 %  La    2.18 % La2O3
   Cerium      5.62 %  Ce    6.58 % Ce2O3
   Yttrium     3.56 %  Y     4.52 % Y2O3
   Uranium     3.18 %  U     3.61 % UO2
   Titanium   38.38 %  Ti   64.03 % TiO2
   Iron       14.92 %  Fe   21.33 % Fe2O3
   Oxygen     32.49 %  O
             ______        ______ 
             100.00 %      102.24 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ce0.75La0.25Y0.75U0.25Ti15Fe3+5O38
Help on Environment: Environment: In pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1960
Help on Locality: Locality: Tuftane, Iveland, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its composition and for Tenatt William Edgeworth David (1858-1934), Australian geologist.
 

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Davidite-(Ce) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.01522
Help on Cell Dimensions: Cell Dimensions: a = 10.376, c = 20.91, Z = 3; V = 1,949.60 Den(Calc)= 4.78
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.69(1), 1.7(1), 1.435(0.9),2.23(0.8), 2.86(0.8), 1.59(0.8), 3.21(0.7), 3.37(0.7),
 

Physical Properties of Davidite-(Ce)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Brownish black, Red, Black.
Help on Density: Density: 4.42 - 4.46, Average = 4.43
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Metallic
Help on Streak: Streak: grayish black
 

Optical Properties of Davidite-(Ce)

Help on Optical Data: Optical Data: NCalc= 2.64 - from Gladstone-Dale relationship (KC = 0.3428) where Ncalc=Dcalc*KC+1
NCalc= 2.52 - from Gladstone-Dale relationship (KC = 0.3428) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Davidite-(Ce)

Help on Electron Density: Electron Density:

relectron=4.46 gm/cc
note: rDavidite-(Ce) =4.78 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.05318
Boson Index = 0.94682
Help on Photoelectric: Photoelectric:

PEDavidite-(Ce) = 129.18 barns/electron
U=PEDavidite-(Ce) x relectron= 576.78 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 260,609.63 (Gamma Ray American Petroleum Institute Units)

Davidite-(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) 116.71 ± 29.18 grams of pure Davidite-(Ce) .

Estimated Radioactivity from Davidite-(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 / 7.37 cm 5,859,192 1.58E-04 260,609.63 85.68
100 gm / 3.42 cm 585,919 1.58E-05 26,060.96 8.57
10 gm / 1.59 cm 58,592 1.58E-06 2,606.10 0.86
1 gm / 7.37 mm 5,859 1.58E-07 260.61 0.09
0.1 gm / 3.42 mm 586 1.58E-08 26.06 0.01
0.01 gm / 1.59 mm 59 1.58E-09 2.61 0.00
0.001 gm / 0.74 mm 6 1.58E-10 0.26 0.00

Weight of pure Davidite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.78 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 ( 0.37 % Th) From Sum REE Elements ( 7.47 % REE)
 

Davidite-(Ce) Classification
Help on Dana Class: Dana Class: 8.5.1.6 (8)Multiple Oxides with Nb, Ta, and Ti
  (8.5)Dana Type
  (8.5.1)Crichtonite group (ABC18 T2 O38)
 
8.5.1.1 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
8.5.1.2 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
8.5.1.3 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.4 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 
8.5.1.5 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.6 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
8.5.1.7 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.8 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
8.5.1.9 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
8.5.1.10 Cleusonite! Pb(U,U)(Ti,Fe2,Fe3)20(O,OH)38 R 3 3
 
8.5.1.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
Help on Strunz Class: Strunz Class: IV/C.09-70 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.09 - Crichtonite group
 
IV/C.09-10 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3
 
IV/C.09-20 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-30 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3
 
IV/C.09-40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3
 
IV/C.09-45 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3
 
IV/C.09-50 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3
 
IV/C.09-60 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-62 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3
 
IV/C.09-70 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3
 
IV/C.09-80 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3
 

Other Davidite-(Ce) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Davidite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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Print or Cut-and-Paste your Davidite-(Ce) Specimen Label here :

Davidite-(Ce)

(Ce,La)(Y,U)(Ti,Fe+++)20O38
Dana No: 8.5.1.6 Strunz No: IV/C.09-70
Locality:

 

Notes:

 
 
   
 
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