Euxenite-(Y) Mineral Data

Advertisment

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

General Euxenite-(Y) Information

Chemical Formula:

(Y,Ca,Ce)(Nb,Ta,Ti)2O6

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

Empirical Formula:

Y_0.7Ca_0.2Ce_0.12(Ta_0.2)2(Nb_0.7)2(Ti_0.1)O₆

Environment:

Granite pegmatites and a component of detrital black sands.

IMA Status:

Valid Species (Pre-IMA) 1870

Locality:

Jolster, Sondfjord, Norway. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "friendly to strangers, hospitable," in allusion to the rare elements that it contains.

Name Pronunciation:

Euxenite-(Y)

Synonym:

ICSD 100175

Lyndochite

PDF 14-463

Euxenite-(Y) Image

Images:

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

Axial Ratios:

a:b:c =0.3788:1:0.3545

Cell Dimensions:

a = 5.52, b = 14.57, c = 5.166, Z = 3; V = 415.48 Den(Calc)= 4.70

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pcan

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

By Intensity(I/I_o): 2.99(1), 2.95(0.4), 3.66(0.4),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Weitzel H , Schrocke H , Zeitschrift fur Kristallographie , 152 (1980) p.69-82, Kristallstrukturverfeinerungen von euxenit, Y(Nb0.5Ti0.5)2O6, und M-fergusonit, YNbO4

Physical Properties of Euxenite-(Y)

Cleavage:

None

Color:

Brownish black, Brown, Yellow, Olive green.

Density:

4.7 - 5, Average = 4.84

Diaphaneity:

Translucent to opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

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

Hardness:

6.5 - Pyrite

Luminescence:

Non-fluorescent.

Luster:

Greasy (Oily)

Streak:

reddish brown

Optical Properties of Euxenite-(Y)

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

Optical Data:

Isotropic, n=2.06-2.24.

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)

Electron Density:

Bulk Density (Electron Density)=4.35 gm/cc
note: Specific Gravity of Euxenite-(Y) =4.85 gm/cc.

Fermion Index:

Fermion Index = 0.0033235343
Boson Index = 0.9966764657

Photoelectric:

PE_Euxenite-(Y)= 303.63 barns/electron
U=PE_Euxenite-(Y) x r_electron=1,322.15 barns/cc.

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 Becquerels (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

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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

Search for Euxenite-(Y) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Euxenite-(Y) :

Dakota Matrix Minerals Google Search for Euxenite-(Y)
John Betts Fine Minerals Search for Euxenite-(Y)
McDougall Minerals Google Search for Euxenite-(Y)
Rock and Mineral Shows Google Search for Euxenite-(Y)
Weinrich Minerals, Inc. Google Search for Euxenite-(Y)

Ask about Euxenite-(Y) 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 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: