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Euxenite-(Y) Mineral Data

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General Euxenite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Ca,Ce)(Nb,Ta,Ti)2O6
Help on Composition: Composition: Molecular Weight = 392.28 gm
   Calcium    2.04 %  Ca    2.86 % CaO
   Cerium     3.57 %  Ce    4.18 % Ce2O3
   Yttrium   15.86 %  Y    20.15 % Y2O3
   Tantalum  18.45 %  Ta   22.53 % Ta2O5
   Titanium   2.44 %  Ti    4.07 % TiO2
   Niobium   33.16 %  Nb   47.43 % Nb2O5
   Oxygen    24.47 %  O
            ______        ______ 
            100.00 %      101.22 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Y0.7Ca0.2Ce0.12(Ta0.2)2(Nb0.7)2(Ti0.1)O6
Help on Environment: Environment: Granite pegmatites and a component of detrital black sands.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1870
Help on Locality: Locality: Jolster, Sondfjord, Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "friendly to strangers, hospitable," in allusion to the rare elements that it contains.
Help on Name Pronunciation: Name Pronunciation: Euxenite-(Y) Say EUXENITE-(Y)
Help on Synonym: Synonym: ICSD 100175
  Lyndochite
  PDF 14-463
 

Euxenite-(Y) Image

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  Euxenite-(Y)

Comments: Crystal of euxenite-(Y) in matrix.
Location: Trout Creek Pass, Chaffee County, Colorado, USA. Scale: Crystal size 1.5 cm.
© John Veevaert

Euxenite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3788:1:0.3545
Help on Cell Dimensions: Cell Dimensions: a = 5.52, b = 14.57, c = 5.166, Z = 3; V = 415.48 Den(Calc)= 4.70
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pcan
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.99(1), 2.95(0.4), 3.66(0.4),
 

Physical Properties of Euxenite-(Y)

Help on Cleavage: Cleavage: None
Help on Color: Color: Brownish black, Brown, Yellow, Olive green.
Help on Density: Density: 4.7 - 5, Average = 4.84
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
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: 6.5 - Pyrite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Greasy (Oily)
Help on Streak: Streak: reddish brown
 

Optical Properties of Euxenite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.095 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2447,KPDmeas= 0.2371,KC= 0.2234
Ncalc = 2.05 - 2.12
Help on Optical Data: Optical Data: Isotropic, n=2.06-2.24.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Euxenite-(Y) in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 470 nm   13.70   15.60 
   
 546 nm   13.00   15.60 
 589 nm   12.50   15.00 
 650 nm   12.40   15.00 
Calculated Relative Intensity Colors of Euxenite-(Y) in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 700%
R1                        
R2                        
 

Calculated Properties of Euxenite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.35 gm/cc
note: Specific Gravity of Euxenite-(Y) =4.85 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0033235343
Boson Index = 0.9966764657
Help on Photoelectric: Photoelectric: PEEuxenite-(Y) = 303.63 barns/electron
U=PEEuxenite-(Y) x relectron=1,322.15 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,420.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Euxenite-(Y) per GRapi unit = 292.34 (PPM)

Euxenite-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Euxenite-(Y) - mild
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 / 7.33 cm 80,008 2.16E-06 3,420.62 1.12
100 gm / 3.40 cm 8,001 2.16E-07 342.06 0.11
10 gm / 1.58 cm 800 2.16E-08 34.21 0.01
1 gm / 7.33 mm 80 2.16E-09 3.42 0.00
0.1 gm / 3.40 mm 8 2.16E-10 0.34 0.00
0.01 gm / 1.58 mm 1 2.16E-11 0.03 0.00
0.001 gm / 0.73 mm 0 2.16E-12 0.00 0.00

Weight of pure Euxenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.85 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 ( 0.18 % Th) From Sum REE Elements ( 3.57 % REE)
 

Euxenite-(Y) Classification

Help on  Dana Class: Dana Class: 08.03.08.02 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.08)Polycrase Group
 
08.03.08.01 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
08.03.08.02 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
08.03.08.03 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m
 
08.03.08.04 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho
 
08.03.08.05 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DG.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DG -With large (� medium-sized) cations; chains of edge-sharing octahedra
 
04.DG.05 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m
 
04.DG.05 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m
 
04.DG.05 Kobeite-(Y) (Y,U)(Ti,Nb)2(O,OH)6(?) Cubic Cubic
 
04.DG.05 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho
 
04.DG.05 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m
 
04.DG.05 Tanteuxenite-(Y) (Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6 Pcan 2/m 2/m 2/m
 
04.DG.05 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m
 
04.DG.05 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho
 

Other Euxenite-(Y) Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Euxenite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Print or Cut-and-Paste your Euxenite-(Y) Specimen Label here :

Euxenite-(Y)

(Y,Ca,Ce)(Nb,Ta,Ti)2O6
Dana No: 08.03.08.02 Strunz No: 04.DG.05
Locality:

 

Notes:

 

 
   
 


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