Davidite-(La) Mineral Data + Say DAVIDITE-(LA)


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General Davidite-(La) Information
Help on Chemical Formula: Chemical Formula: (La,Ce,Ca)(Y,U)(Ti,Fe+++)20O38
Help on Composition: Composition: Molecular Weight = 1,860.86 gm
   Calcium     0.22 %  Ca    0.30 % CaO
   Lanthanum   5.23 %  La    6.13 % La2O3
   Cerium      1.51 %  Ce    1.76 % Ce2O3
   Yttrium     3.58 %  Y     4.55 % Y2O3
   Uranium     3.20 %  U     3.63 % UO2
   Titanium   38.59 %  Ti   64.39 % TiO2
   Iron       15.01 %  Fe   21.45 % Fe2O3
   Oxygen     32.67 %  O
             ______        ______ 
             100.00 %      102.21 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La0.7Ce0.2Ca0.1Y0.75U0.25Ti15Fe3+5O38
Help on Environment: Environment: Uranium-rich pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1906
Help on Locality: Locality: Radium Hill mine, Olary Province, SA, Australia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Tenatt William Edgeworth David (1858-1934), Australian geologist.
Help on Synonym: Synonym: ICSD 100554
  PDF 42-576
 

Davidite-(La) Image

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Davidite-(La)

Comments: Prismatic crystals of davidite in carbonatite.
Location: Thackering, South West Australia, Australia. Scale: Crystal size 2 cm.
© John Veevaert

Davidite-(La) 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)= 4.75
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): 2.895(1), 3.42(0.72), 2.85(0.6),
Click Here for Large Davidite-(La) Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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Gatehouse B M , Grey I E , Kelly P R , American Mineralogist , 64 (1979) p.1010-1017, The crystal structure of davidite

 

Physical Properties of Davidite-(La)

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Grayish black, Brownish black, Dark brown, Reddish.
Help on Density: Density: 4.42
Help on Diaphaniety: Diaphaniety: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Metallic
Help on Streak: Streak: brownish black
 

Optical Properties of Davidite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.146 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.205 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2737,KPDmeas= 0.2941,KC= 0.3442
Help on Optical Data: Optical Data: Isotropic, n=2.3.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Davidite-(La) in Air
λ R  ∑ R(λ) 
 400 nm   19.40   
 420 nm   19.00 
 440 nm   18.60 
 460 nm   18.10 
 480 nm   17.80 
 500 nm   17.50 
 520 nm   17.30 
 540 nm   17.20 
 560 nm   17.00 
 580 nm   17.00 
 600 nm   16.90 
 620 nm   16.80 
 640 nm   16.80 
 660 nm   16.80 
 680 nm   16.70 
 700 nm   16.60 
Calculated Relative Intensity Colors of Davidite-(La) in Air
Relative
Intensity		    0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 520%
R                      
 

Calculated Properties of Davidite-(La)

Help on Electron Density: Electron Density:

relectron=4.13 gm/cc
note: rDavidite-(La) =4.42 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.05352
Boson Index = 0.94648
Help on Photoelectric: Photoelectric:

PEDavidite-(La) = 124.84 barns/electron
U=PEDavidite-(La) x relectron= 515.80 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 261,510.45 (Gamma Ray American Petroleum Institute Units)

Davidite-(La) 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) 116.31 ± 29.08 grams of pure Davidite-(La) .

Estimated Radioactivity from Davidite-(La) - 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 / 7.56 cm 5,874,875 1.59E-04 261,510.45 85.98
100 gm / 3.51 cm 587,488 1.59E-05 26,151.05 8.60
10 gm / 1.63 cm 58,749 1.59E-06 2,615.10 0.86
1 gm / 7.56 mm 5,875 1.59E-07 261.51 0.09
0.1 gm / 3.51 mm 587 1.59E-08 26.15 0.01
0.01 gm / 1.63 mm 59 1.59E-09 2.62 0.00
0.001 gm / 0.76 mm 6 1.59E-10 0.26 0.00

Weight of pure Davidite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.42 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 ( 0.34 % Th) From Sum REE Elements ( 6.73 % REE)
 

Davidite-(La) Classification
Help on Dana Class: Dana Class: 8.5.1.5 (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.09-60 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-(La) Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Davidite-(La) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 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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Davidite-(La)

(La,Ce,Ca)(Y,U)(Ti,Fe+++)20O38
Dana No: 8.5.1.5 Strunz No: IV/C.09-60
Locality:

 

Notes:

 
 
   
 
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