General Yttrocolumbite-(Y) Information
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Chemical Formula: |
(Y,U,Fe++)(Nb,Ta)O4 |
Composition: |
Molecular Weight = 296.62 gm |
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Yttrium 17.98 % Y 22.84 % Y2O3 |
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Uranium 16.05 % U 18.21 % UO2 |
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Tantalum 15.25 % Ta 18.62 % Ta2O5 |
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Niobium 23.49 % Nb 33.61 % Nb2O5 |
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Iron 5.65 % Fe 7.27 % FeO |
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Oxygen 21.58 % O |
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______ ______ |
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100.00 % 100.54 % = TOTAL OXIDE |
Empirical Formula: |
Y0.6U0.2Fe2+0.3Nb0.75Ta0.25O4 |
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
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Crystal System: |
OrthorhombicSpace Group: Unk |
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Physical Properties of Yttrocolumbite-(Y)
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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 |
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Optical Properties of Yttrocolumbite-(Y)
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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 |
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Calculated Properties of Yttrocolumbite-(Y)
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Electron Density: |
relectron=5.22 gm/cc note: rYttrocolumbite-(Y) =5.93 gm/cc. |
Fermion Index |
Fermion Index = 0.00247 Boson Index = 0.99753 |
Photoelectric: |
PEYttrocolumbite-(Y) = 655.36 barns/electron U=PEYttrocolumbite-(Y) x relectron=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)
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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
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Yttrocolumbite-(Y) Classification
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Dana Class: |
8.1.3.2 (8)Multiple Oxides with Nb, Ta, and Ti |
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(8.1)where A BO4 |
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(8.1.3)Dana Group |
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8.1.3.1 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m |
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8.1.3.2 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho |
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8.1.3.3 Iwashiroite-(Y)! YTaO4 P 2/a 2/m |
Strunz Class: |
IV/D.19-80 IV - Oxides |
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IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) |
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IV/D.19 - Polycrase-(Y) - Loranskite-(Y) series |
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IV/D.19-10 Polycrase-(Y) (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6 Pcan 2/m 2/m 2/m |
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IV/D.19-15 Uranopolycrase (U,Y)(Ti,Nb,Ta)2O6 P bcn 2/m 2/m 2/m |
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IV/D.19-20 Yttrocrasite-(Y) (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 Unk Ortho |
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IV/D.19-30 Fersmite (Ca,Ce,Na)(Nb,Ta,Ti)2(O,OH,F)6 Pcan 2/m 2/m 2/m |
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IV/D.19-40 Euxenite-(Y) (Y,Ca,Ce)(Nb,Ta,Ti)2O6 Pcan 2/m 2/m 2/m |
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IV/D.19-60 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m |
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IV/D.19-70 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho |
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IV/D.19-80 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho |
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IV/D.19-90 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m |
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IV/D.19-100 Loranskite-(Y) (Y,Ce,Ca)ZrTaO6(?) Unk Ortho |
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Other Yttrocolumbite-(Y) Information
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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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Print or Cut-and-Paste your Yttrocolumbite-(Y) Specimen Label here :
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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:
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