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: |
Ce0.75La0.25Y0.75U0.25Ti15Fe3+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. |
| |
Search for Davidite-(Ce) Images |
Images:
|
|
| | |
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 - RhombohedralH-M Symbol ( 3) Space Group: R 3 |
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)
|
Cleavage: |
None |
Color: |
Brown, Brownish black, Red, Black. |
Density: |
4.42 - 4.46, Average = 4.43 |
Diaphaniety: |
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: |
relectron=4.46 gm/cc note: rDavidite-(Ce) =4.78 gm/cc. |
Fermion Index |
Fermion Index = 0.05318 Boson Index = 0.94682 |
Photoelectric: |
PEDavidite-(Ce) = 129.18 barns/electron U=PEDavidite-(Ce) x relectron= 576.78 barns/cc. |
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
|
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 |
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
|
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 -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
Search for Davidite-(Ce) using:
[ALTAVISTA]
[AOL]
[About.com]
[All-The-Web]
[HotBot]
[Ixquick]
[LookSmart]
[MAMMA]
[MSN.COM]
[Netscape]
[Teoma]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Davidite-(Ce) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop
Translate Davidite-(Ce) Mineral Data :
Ask about Davidite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Español
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:
|
|
| |
| |
|
| |