Davidite-(Ce) Mineral Data

General Davidite-(Ce) Information

Chemical Formula:

(Ce,La)(Y,U)(Ti,Fe+++)20O38

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

Empirical Formula:

Ce_0.75La_0.25Y_0.75U_0.25Ti₁₅Fe³⁺₅O₃₈

Environment:

In pegmatites.

IMA Status:

Approved IMA 1960

Locality:

Tuftane, Iveland, Norway. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and for Tenatt William Edgeworth David (1858-1934), Australian geologist.

Name Pronunciation:

Davidite-(Ce)

Davidite-(Ce) Image

Images:

Davidite-(Ce)

Comments: Black, granular crystals of davidite-(Ce) in matrix.
Location: Kukisvumchorr Mt., Khibiny Massif, Kola Peninsula, Russia. Scale: Specimen Size 9x5x5 mm.
© Sergey Vasiliev / Systematic Mineralogy

Davidite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.01522

Cell Dimensions:

a = 10.376, c = 20.91, Z = 3; V = 1,949.60 Den(Calc)= 4.78

Crystal System:

Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: R 3

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

By Intensity(I/I_o): 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)

Cleavage:

None

Color:

Brown, Brownish black, Red, Black.

Density:

4.42 - 4.46, Average = 4.43

Diaphaneity:

Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Pyramidal - Crystals are shaped like pyramids.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

6 - Orthoclase

Luster:

Vitreous - Metallic

Streak:

grayish black

Optical Properties of Davidite-(Ce)

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)

Electron Density:

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

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Davidite-(Ce)}= 129.18 barns/electron
U=PE_{Davidite-(Ce)} x r_electron= 576.78 barns/cc.

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
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	5,859,200	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

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

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

References:

NAME( Dana8) PHYS. PROP.(Dana8)

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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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:

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