Samarskite-(Y) Mineral Data

Samarskite-(Y) Mineral Data +

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General Samarskite-(Y) Information

Chemical Formula:

(Y,Fe+++,U)(Nb,Ta)5O4

Composition:

Molecular Weight = 299.85 gm

La,Ce,Pr,Nd,Sm, 14.41 % RE 16.81 % REE₂O₃

Yttrium 5.93 % Y 7.53 % Y₂O₃

Uranium 15.88 % U 18.01 % UO₂

Tantalum 12.07 % Ta 14.74 % Ta₂O₅

Niobium 24.79 % Nb 35.46 % Nb₂O₅

Iron 5.59 % Fe 7.99 % Fe₂O₃

Oxygen 21.34 % O

______ ______

100.00 % 100.53 % = TOTAL OXIDE

Empirical Formula:

Y_0.2REE_0.3Fe³⁺_0.3U_0.2Nb_0.8Ta_0.2O₄

Environment:

Accessory mineral in REE-rich granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1847

Locality:

Miass, Ilmen Mountains, Southern Ural Mountains, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Vasilii Yefrafovich von Samarski-Bykhovets (1803-1870), Chief of Staff of the Russian Corps of Mining Engineers.

Samarskite-(Y) Image

Images:

Samarskite-(Y)

Comments: A black crystal of samarskite. Ex collection Gustav Rose 1832, found on his travel together with Alexander von Humboldt through the Ural Mts.
Location: Miass, Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia. Scale: Crystal size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Samarskite-(Y) Uranpyrochlore

Comments: Deep greenish-brown resinous crystalline massive uranpyrochlore with black samarskite-(Y).
Location: Beryl Hill, near Yinnietharra Station, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Samarskite-(Y)

Comments: Dark, coaly black, weathered granular samarskite-(Y).
Location: Spinelli Samarskite Prospect, Glastonbury, Hartford Co., Connecticut, USA. Scale: Picture size 4 mm.
© Paul M. Schumacher

Samarskite-(Y) Crystallography

Axial Ratios:

a:b:c =0.3834:1:0.357

Cell Dimensions:

a = 5.498, b = 14.34, c = 5.12, Z = 4; V = 403.67 Den(Calc)= 4.93

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

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

By Intensity(I/I_o): 2.98(1), 2.92(0.9), 3.13(0.4),

Forms:

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Forms: [ 1 2 1] [ 1 0 1] [ 2 0 1] [ 0 1 0] [ 1 1 1] [ 1 0 0] [ 0 0 1]

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Physical Properties of Samarskite-(Y)

Cleavage:

[???] Imperfect

Color:

Black, Brownish, Yellowish brown.

Density:

5.6 - 5.8, Average = 5.69

Diaphaniety:

Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Resinous

Magnetism:

Nonmagnetic

Streak:

reddish brown

Optical Properties of Samarskite-(Y)

Gladstone-Dale:

CI meas= -0.079 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.247 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2434,KPDmeas= 0.2105,KC= 0.1952

Optical Data:

Isotropic, n=2.2.

Calculated Properties of Samarskite-(Y)

Electron Density:

r_electron=5.01 gm/cc
note: r_{Samarskite-(Y)}=5.70 gm/cc.

Fermion Index

Fermion Index = 0.02924
Boson Index = 0.97076

Photoelectric:

PE_{Samarskite-(Y)}= 694.08 barns/electron
U=PE_{Samarskite-(Y)} x r_electron=3,475.30 barns/cc.

Radioactivity:

GRapi = 1,202,299.46 (Gamma Ray American Petroleum Institute Units)

Samarskite-(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) 25.30 ± 6.32 grams of pure Samarskite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2529.9 ±632.47 grams of pure Samarskite-(Y) .

**Estimated Radioactivity from Samarskite-(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 / 6.95 cm	28,742,543	7.77E-04	1,202,299.46	395.28
100 gm / 3.22 cm	2,874,254	7.77E-05	120,229.95	39.53
10 gm / 1.50 cm	287,425	7.77E-06	12,022.99	3.95
1 gm / 6.95 mm	28,743	7.77E-07	1,202.30	0.40
0.1 gm / 3.22 mm	2,874	7.77E-08	120.23	0.04
0.01 gm / 1.50 mm	287	7.77E-09	12.02	0.00
0.001 gm / 0.69 mm	29	7.77E-10	1.20	0.00

Weight of pure Samarskite-(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
Estimated Thorium Activity ( 0.72 % Th) From Sum REE Elements (14.41 % REE)

Samarskite-(Y) Classification

Dana Class:

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

(8.1)where A BO4

(8.1.11)Dana Group

8.1.11.1 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m

8.1.11.2 IMA2004-001! [(REEY),U,Th,Ca,Fe](Nb,Ta,Ti)O4 P 2/c 2/m

Strunz Class:

IV/D.19-60 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 Samarskite-(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 Samarskite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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

Samarskite-(Y)

(Y,Fe+++,U)(Nb,Ta)5O4
Dana No: 8.1.11.1 Strunz No: IV/D.19-60
Locality:

Notes: