Tanteuxenite-(Y) Mineral Data

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General Tanteuxenite-(Y) Information

Chemical Formula:

(Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6

Composition:

Molecular Weight = 480.83 gm

Calcium 1.67 % Ca 2.33 % CaO

Cerium 2.91 % Ce 3.41 % Ce₂O₃

Yttrium 12.94 % Y 16.44 % Y₂O₃

Tantalum 52.69 % Ta 64.33 % Ta₂O₅

Titanium 1.99 % Ti 3.32 % TiO₂

Niobium 7.73 % Nb 11.06 % Nb₂O₅

Hydrogen 0.10 % H 0.94 % H₂O

Oxygen 19.96 % O

______ ______

100.00 % 101.83 % = TOTAL OXIDE

Empirical Formula:

Y_0.7Ca_0.2Ce_0.12(Ta_0.7)2(Nb_0.2)2(Ti_0.1)O_5.5(OH)_0.5

Environment:

Tin placers.

IMA Status:

Valid Species (Pre-IMA) 1928

Locality:

Cooglegong, Pilbara, WA, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Tantalum) and the Greek for "friendly to strangers, hospitable," in allusion to the rare elements that it contains.

Name Pronunciation:

Tanteuxenite-(Y) + Pronunciation

Synonym:

Delorenzite

Tanteuxenite-(Y) Image

Images:

Tanteuxenite-(Y)

Comments: Irregular fragment of tanteuxenite-(Y).
Location: Liha, Maniema, Democratic Republic of Congo (Zaïre). Scale: Specimen Size 1.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Tanteuxenite-(Y) Crystallography

Axial Ratios:

a:b:c =0.3555:1:0.3788

Cell Dimensions:

a = 5.18, b = 14.57, c = 5.52, Z = 3; V = 416.61 Den(Calc)= 5.75

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): 3.12(1), 2.87(0.7), 2.52(0.3),2.67(0.3), 2.15(0.1), 2.28(0.1),

Forms:

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Forms: ( 2 0 1) ( 0 1 0) ( 1 0 0) ( 1 1 0)

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Physical Properties of Tanteuxenite-(Y)

Cleavage:

{???} Indistinct

Color:

Brownish black.

Density:

5.4 - 5.9, Average = 5.65

Diaphaneity:

Subtranslucent to Opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Indistinct - Crystals or grains are unremarkable or poorly formed. Anhedral to subhedral crystals.

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Resinous

Streak:

brownish gray

Optical Properties of Tanteuxenite-(Y)

Optical Data:

NCalc= 2.04 - from Gladstone-Dale relationship (KC = 0.1808) where Ncalc=Dcalc*KC+1
NCalc= 2.02 - from Gladstone-Dale relationship (KC = 0.1808) where Ncalc=Dmeas*KC+1

Calculated Properties of Tanteuxenite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.99 gm/cc
note: Specific Gravity of Tanteuxenite-(Y) =5.75 gm/cc.

Fermion Index:

Fermion Index = 0.0027568138
Boson Index = 0.9972431862

Photoelectric:

PE_{Tanteuxenite-(Y)}= 671.48 barns/electron
U=PE_{Tanteuxenite-(Y)} x r_electron=3,350.09 barns/cc.

Radioactivity:

GRapi = 2,697.01 (Gamma Ray American Petroleum Institute Units)
Concentration of Tanteuxenite-(Y) per GRapi unit = 370.78 (PPM)

**Estimated Radioactivity from Tanteuxenite-(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 / 6.93 cm	65,275	1.76E-06	2,697.01	0.89
100 gm / 3.21 cm	6,528	1.76E-07	269.70	0.09
10 gm / 1.49 cm	653	1.76E-08	26.97	0.01
1 gm / 6.93 mm	65	1.76E-09	2.70	0.00
0.1 gm / 3.21 mm	7	1.76E-10	0.27	0.00
0.01 gm / 1.49 mm	1	1.76E-11	0.03	0.00
0.001 gm / 0.69 mm	0	1.76E-12	0.00	0.00

Weight of pure Tanteuxenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.75 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 ( 0.15 % Th) From Sum REE Elements ( 2.91 % REE)

Tanteuxenite-(Y) Classification

Dana Class:

08.03.08.03 (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 Tanteuxenite-(Y) Information

References:

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

See Also:

Links to other databases for Tanteuxenite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Tanteuxenite-(Y)

(Y,Ce,Ca)(Ta,Nb,Ti)2(O,OH)6
Dana No: 08.03.08.03 Strunz No: 04.DG.05
Locality:

Notes: