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Samarskite-(Y) Mineral Data

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General Samarskite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Y,Fe+++,U)(Nb,Ta)5O4
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Y0.2REE0.3Fe3+0.3U0.2Nb0.8Ta0.2O4
Help on Environment: Environment: Accessory mineral in REE-rich granite pegmatites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1847
Help on Locality: Locality: Miass, Ilmen Mountains, Southern Ural Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Vasilii Yefrafovich von Samarski-Bykhovets (1803-1870), Chief of Staff of the Russian Corps of Mining Engineers.
Help on Name Pronunciation: Name Pronunciation: Samarskite-(Y) + Pronunciation Say SAMARSKITE-(Y)
Help on Synonym: Synonym: Priazovite - mixture of samarskite-(Y) and U,Ti-rich mineral of the pyrochlore group
 

Samarskite-(Y) Image

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  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

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  Uranpyrochlore   Samarskite-(Y)

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

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  Samarskite-(Y)

Comments: A small but intricate cluster of fairly sharp samarskite-(Y) crystals (overall dimensions 15 by 15 by 22 mm) dug from the floor of the open cut.
Location: Spinelli Quarry (Spinelli prospect), South Glastonbury, Glastonbury, Hartford Co., Connecticut, USA. Scale: See Image.
© Fred Davis

Samarskite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3834:1:0.357
Help on Cell Dimensions: Cell Dimensions: a = 5.498, b = 14.34, c = 5.12, Z = 4; V = 403.67 Den(Calc)= 4.93
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.98(1), 2.92(0.9), 3.13(0.4),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
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I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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)

Help on Cleavage: Cleavage: {???} Imperfect
Help on Color: Color: Black, Brownish, Yellowish brown.
Help on Density: Density: 5.6 - 5.8, Average = 5.69
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: reddish brown
 

Optical Properties of Samarskite-(Y)

Help on Gladstone-Dale: 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
Ncalc = 1.96 - 2.13
Help on Optical Data: Optical Data: Isotropic, n=2.2.
 

Calculated Properties of Samarskite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.01 gm/cc
note: Specific Gravity of Samarskite-(Y) =5.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PESamarskite-(Y) = 694.08 barns/electron
U=PESamarskite-(Y) x relectron=3,475.30 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1,202,300.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Samarskite-(Y) per GRapi unit = 831.74 (PPB)

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 28,742,552 7.77E-04 1,202,300.20 395.28
100 gm / 3.22 cm 2,874,255 7.77E-05 120,230.02 39.53
10 gm / 1.50 cm 287,426 7.77E-06 12,023.00 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

Help on  Dana Class: Dana Class: 08.01.11.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.01)where A BO4
  (08.01.11)Samarskite Group
 
08.01.11.01 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
 
08.01.11.02 Samarskite-(Yb)! (Yb,Y,REE,U,Th,Ca,Fe)(Nb,Ta,Ti)O4 P 2/c 2/m
Help on  Strunz Class: Strunz Class: 04.DB.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DB -With medium-sized cations; chains of edge-sharing octahedra
 
04.DB.25 Ixiolite (Ta,Nb,Sn,Mn,Fe)O2 P 2/c 2/m
 
04.DB.25 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
 
04.DB.25 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m
 
04.DB.25 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
 
04.DB.25 Samarskite-(Yb)! (Yb,Y,REE,U,Th,Ca,Fe)(Nb,Ta,Ti)O4 P 2/c 2/m
 
04.DB.25 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho
 

Other Samarskite-(Y) Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Samarskite-(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 Samarskite-(Y) Specimen Label here :

Samarskite-(Y)

(Y,Fe+++,U)(Nb,Ta)5O4
Dana No: 08.01.11.01 Strunz No: 04.DB.25
Locality:

 

Notes:

 

 
   
 


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