Yttrocolumbite-(Y) Mineral Data

Yttrocolumbite-(Y) Mineral Data +

General Yttrocolumbite-(Y) Information

Chemical Formula:

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

Composition:

Molecular Weight = 296.62 gm

Yttrium 17.98 % Y 22.84 % Y₂O₃

Uranium 16.05 % U 18.21 % UO₂

Tantalum 15.25 % Ta 18.62 % Ta₂O₅

Niobium 23.49 % Nb 33.61 % Nb₂O₅

Iron 5.65 % Fe 7.27 % FeO

Oxygen 21.58 % O

______ ______

100.00 % 100.54 % = TOTAL OXIDE

Empirical Formula:

Y_0.6U_0.2Fe²⁺_0.3Nb_0.75Ta_0.25O₄

IMA Status:

Valid Species (Pre-IMA) 1837

Locality:

Mozambique. Link to MinDat.org Location Data.

Name Origin:

Named for the composition (Ytterbium, Columbium (former name for niobium)).

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Yttrocolumbite-(Y) Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

Physical Properties of Yttrocolumbite-(Y)

Color:

Black.

Density:

5.7 - 6.15, Average = 5.92

Diaphaniety:

Subtranslucent to Opaque

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Sub Metallic

Streak:

brown

Optical Properties of Yttrocolumbite-(Y)

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1941,KC= 0.1889

Optical Data:

Biaxial (+), b=2.15

Calculated Properties of Yttrocolumbite-(Y)

Electron Density:

r_electron=5.22 gm/cc
note: r_{Yttrocolumbite-(Y)}=5.93 gm/cc.

Fermion Index

Fermion Index = 0.00247
Boson Index = 0.99753

Photoelectric:

PE_{Yttrocolumbite-(Y)}= 655.36 barns/electron
U=PE_{Yttrocolumbite-(Y)} x r_electron=3,419.37 barns/cc.

Radioactivity:

GRapi = 1,204,680.87 (Gamma Ray American Petroleum Institute Units)

Yttrocolumbite-(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) 25.25 ± 6.31 grams of pure Yttrocolumbite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2524.9 ±631.22 grams of pure Yttrocolumbite-(Y) .

**Estimated Radioactivity from Yttrocolumbite-(Y)** - very 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 / 6.86 cm	28,728,659	7.76E-04	1,204,680.87	396.06
100 gm / 3.18 cm	2,872,866	7.76E-05	120,468.09	39.61
10 gm / 1.48 cm	287,287	7.76E-06	12,046.81	3.96
1 gm / 6.86 mm	28,729	7.76E-07	1,204.68	0.40
0.1 gm / 3.18 mm	2,873	7.76E-08	120.47	0.04
0.01 gm / 1.48 mm	287	7.76E-09	12.05	0.00
0.001 gm / 0.69 mm	29	7.76E-10	1.20	0.00

Weight of pure Yttrocolumbite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.93 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

Yttrocolumbite-(Y) Classification

Dana Class:

8.1.3.2 (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.19-80 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 Yttrocolumbite-(Y) Information

References:

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

See Also:

Links to other databases for Yttrocolumbite-(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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Yttrocolumbite-(Y)

(Y,U,Fe++)(Nb,Ta)O4
Dana No: 8.1.3.2 Strunz No: IV/D.19-80
Locality:

Notes: