Yttrotantalite-(Y) Mineral Data

General Yttrotantalite-(Y) Information

Chemical Formula:

(Y,U,Fe++)(Ta,Nb)O4

Composition:

Molecular Weight = 315.74 gm

Yttrium 19.71 % Y 25.03 % Y₂O₃

Uranium 7.54 % U 8.55 % UO₂

Tantalum 40.12 % Ta 48.98 % Ta₂O₅

Niobium 8.83 % Nb 12.63 % Nb₂O₅

Iron 3.54 % Fe 4.55 % FeO

Oxygen 20.27 % O

______ ______

100.00 % 99.75 % = TOTAL OXIDE

Empirical Formula:

Y_0.7Fe²⁺_0.2U_0.1Ta_0.7Nb_0.3O₄

Environment:

Accessory mineral in granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1802

Locality:

Ytterby, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for its YTTRium content and relation to tantalite.

Name Pronunciation:

Yttrotantalite-(Y) + Pronunciation

Yttrotantalite-(Y) Image

Images:

Yttrotantalite-(Y)

Comments: Dark greenish-black crystal of Yttrotantalite-(Y).
Location: Ytterby, ResarÃ¶, Vaxholm, Stockholm, Sweden. Scale: Picture size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Yttrotantalite-(Y) Crystallography

Axial Ratios:

a:b:c =0.4881:1:0.4634

Cell Dimensions:

a = 5.34, b = 10.94, c = 5.07, Z = 3; beta = 95.3° V = 294.92 Den(Calc)= 5.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 2.95(1), 1.81(0.9), 1.55(0.9),2.56(0.6), 1.183(0.6), 1.152(0.6), 1.053(0.5),

Forms:

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

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Physical Properties of Yttrotantalite-(Y)

Cleavage:

{010} Imperfect

Color:

Brownish black, Yellowish brown, Yellow.

Density:

5.5 - 5.9, Average = 5.7

Diaphaneity:

Opaque to subtranslucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

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

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

colorless gray

Optical Properties of Yttrotantalite-(Y)

Gladstone-Dale:

CI meas= -0.205 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.288 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2158,KPDmeas= 0.2018,KC= 0.1675
Ncalc = 1.89 - 1.99

Optical Data:

Isotropic, n=2.15.

Calculated Properties of Yttrotantalite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.95 gm/cc
note: Specific Gravity of Yttrotantalite-(Y) =5.70 gm/cc.

Fermion Index:

Fermion Index = 0.0014381814
Boson Index = 0.9985618186

Photoelectric:

PE_{Yttrotantalite-(Y)}= 714.82 barns/electron
U=PE_{Yttrotantalite-(Y)} x r_electron=3,538.41 barns/cc.

Radioactivity:

GRapi = 558,050.16 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrotantalite-(Y) per GRapi unit =1,791.95 (PPB)

Yttrotantalite-(Y) 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) 54.51 ± 13.63 grams of pure Yttrotantalite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5450.5 ±1362.6 grams of pure Yttrotantalite-(Y) .

**Estimated Radioactivity from Yttrotantalite-(Y)** - strong
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 / 6.95 cm	13,494,410	3.65E-04	558,050.16	183.47
100 gm / 3.22 cm	1,349,441	3.65E-05	55,805.02	18.35
10 gm / 1.50 cm	134,944	3.65E-06	5,580.50	1.83
1 gm / 6.95 mm	13,494	3.65E-07	558.05	0.18
0.1 gm / 3.22 mm	1,349	3.65E-08	55.81	0.02
0.01 gm / 1.50 mm	135	3.65E-09	5.58	0.00
0.001 gm / 0.69 mm	13	3.65E-10	0.56	0.00

Weight of pure Yttrotantalite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.70 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

Yttrotantalite-(Y) Classification

Dana Class:

08.01.03.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.03)Yttroantalalite-Yttrocolumbite Series

08.01.03.01 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

08.01.03.02 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho

08.01.03.03 Iwashiroite-(Y)! YTaO4 P 2/a 2/m

Strunz Class:

04.DG.10 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.10 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2

04.DG.10 Fergusonite-beta-(Y) YNbO4 I2 2

04.DG.10 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2

04.DG.10 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

Other Yttrotantalite-(Y) Information

References:

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

See Also:

Links to other databases for Yttrotantalite-(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

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

Yttrotantalite-(Y)

(Y,U,Fe++)(Ta,Nb)O4
Dana No: 08.01.03.01 Strunz No: 04.DG.10
Locality:

Notes: