Yttrotantalite-(Y) Mineral Data

Yttrotantalite-(Y) Mineral Data +

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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.

Yttrotantalite-(Y) Image

Images:

Yttrotantalite-(Y)

Comments: Dark greenish-black crystal of Yttrotantalite-(Y).
Location: Ytterby, Resar?, 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

Diaphaniety:

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

Optical Data:

Isotropic, n=2.15.

Calculated Properties of Yttrotantalite-(Y)

Electron Density:

r_electron=4.95 gm/cc
note: r_{Yttrotantalite-(Y)}=5.70 gm/cc.

Fermion Index

Fermion Index = 0.00143
Boson Index = 0.99857

Photoelectric:

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

Radioactivity:

GRapi = 558,049.44 (Gamma Ray American Petroleum Institute Units)

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 Bequerols (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	13,494,398	3.65E-04	558,049.44	183.47
100 gm / 3.22 cm	1,349,440	3.65E-05	55,804.94	18.35
10 gm / 1.50 cm	134,944	3.65E-06	5,580.49	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	55.80	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:

8.1.3.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.1)where A BO4

(8.1.3)Dana Group

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

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

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

Strunz Class:

IV/D.19-90 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.19 - Polycrase-(Y) - Loranskite-(Y) series

IV/D.19-10 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m

IV/D.19-15 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m

IV/D.19-20 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho

IV/D.19-30 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m

IV/D.19-40 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m

IV/D.19-60 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m

IV/D.19-70 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho

IV/D.19-80 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho

IV/D.19-90 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

IV/D.19-100 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho

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 -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

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Yttrotantalite-(Y)

(Y,U,Fe++)(Ta,Nb)O4
Dana No: 8.1.3.1 Strunz No: IV/D.19-90
Locality:

Notes: