Davidite-(Ce) Mineral Data (original) (raw)

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.

Help on Name Pronunciation: Name Pronunciation:

Davidite-(Ce) Say DAVIDITE-(CE)

Davidite-(Ce) Image

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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 Diaphaneity: Diaphaneity:

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:

Bulk Density (Electron Density)=4.46 gm/cc
note: Specific Gravity of Davidite-(Ce) =4.78 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Help on Photoelectric: Photoelectric:

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

Help on Radioactivity: Radioactivity:

GRapi = 260,610.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Davidite-(Ce) per GRapi unit = 3.84 (PPM)

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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.37 cm 5,859,200 1.58E-04 260,610.06 85.68
100 gm / 3.42 cm 585,920 1.58E-05 26,061.01 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:

08.05.01.06 (08)Multiple Oxides with Nb, Ta, and Ti

(08.05)Dana Type

(08.05.01)Crichtonite group (ABC18 T2 O38)

08.05.01.01 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3

08.05.01.02 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3

08.05.01.03 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3

08.05.01.04 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3

08.05.01.05 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3

08.05.01.06 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3

08.05.01.07 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3

08.05.01.08 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3

08.05.01.09 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3

08.05.01.10 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3

08.05.01.11 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 R 3 3

Help on Strunz Class: Strunz Class:

04.CC.40 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.40 Crichtonite (Sr,La,Ce,Y)(Ti,Fe,Mn)21O38 R 3 3

04.CC.40 Dessauite! (Sr,Pb)(Y,U)(Ti,Fe)20O38 P 3 3

04.CC.40 Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe)20O38 R 3 3

04.CC.40 Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe)20O38 R 3 3

04.CC.40 Mathiasite (K,Ca,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3

04.CC.40 Lindsleyite (Ba,Sr)(Ti,Cr,Fe,Mg)21O38 R 3 3

04.CC.40 Landauite NaMnZn2(Ti,Fe)6Ti12O38 R 3 3

04.CC.40 Loveringite (Ca,Ce)(Ti,Fe,Cr,Mg)21O38 R 3 3

04.CC.40 Senaite Pb(Ti,Fe,Mn)21O38 R 3 3

04.CC.40 Cleusonite! Pb(U,U)(Ti,Fe,Fe)20(O,OH)38 R 3 3

04.CC.40 Gramaccioliite-(Y)! (Pb,Sr)(Y,Mn)Fe2(Ti,Fe)18O38 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 - 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
14 - Uranium Minerals

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Ask about Davidite-(Ce) here :
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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: 08.05.01.06 Strunz No: 04.CC.40
Locality:

Notes: