Samarskite-(Yb) Mineral Data

General Samarskite-(Yb) Information

Chemical Formula:

(Yb,Y,REE,U,Th,Ca,Fe++) (Nb,Ta,Ti)O4

Composition:

Molecular Weight = 312.29 gm

Calcium 1.58 % Ca 2.21 % CaO

Lanthanum 0.04 % La 0.05 % La₂O₃

Cerium 0.18 % Ce 0.21 % Ce₂O₃

Praeseodymium 0.05 % Pr 0.05 % Pr₂O₃

Samarium 0.39 % Sm 0.45 % Sm₂O₃

Gadolinium 0.50 % Gd 0.58 % Gd₂O₃

Dysprosium 2.81 % Dy 3.22 % Dy₂O₃

Yttrium 1.59 % Y 2.02 % Y₂O₃

Holmium 0.53 % Ho 0.60 % Ho₂O₃

Erbium 3.11 % Er 3.55 % Er₂O₃

Thulium 0.54 % Tm 0.62 % Tm₂O₃

Lutetium 0.90 % Lu 1.02 % Lu₂O₃

Terbium 0.25 % Tb 0.29 % Tb₂O₃

Thorium 9.29 % Th 10.57 % ThO₂

Ytterbium 5.32 % Yb 6.06 % Yb₂O₃

Zirconium 0.76 % Zr 1.03 % ZrO₂

Scandium 0.17 % Sc 0.26 % Sc₂O₃

Uranium 9.60 % U 10.89 % UO₂

Tantalum 12.98 % Ta 15.85 % Ta₂O₅

Titanium 0.41 % Ti 0.69 % TiO₂

Manganese 0.83 % Mn 1.07 % MnO

Niobium 21.66 % Nb 30.98 % Nb₂O₅

Iron 2.07 % Fe 2.67 % FeO

Silicon 0.20 % Si 0.42 % SiO₂

Tin 0.46 % Sn 0.58 % SnO₂

Lead 0.27 % Pb 0.29 % PbO

Tungsten 2.47 % W 3.12 % WO₃

Neodymium 0.55 % Nd 0.65 % Nd₂O₃

Oxygen 20.49 % O

______ ______

100.00 % 100.01 % = TOTAL OXIDE

Empirical Formula:

Yb_0.09Er_0.05Y_0.05Dy_0.05Lu_0.01Nd_0.01Tm_0.01Ho_0.01Gd_0.01Sm_0.008Tb_0.005Ce_0.004Pr_0.001La_0.001U_0.12 Th_0.12Ca_0.12Fe²⁺_0.11Mn²⁺_0.04O₄

Environment:

Found as anhedral masses up to tens of centimeters across that are intimately intergrown with ferrocolumbite and zircon.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

Little Patsy pegmatite, Jefferson Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the Yb-dominant analogue of samarskite.

Name Pronunciation:

Samarskite-(Yb) + Pronunciation

Synonym:

IMA2004-001

Samarskite-(Yb) Image

Images:

Samarskite-(Yb)

Comments: Black samarskite-(Yb) on matrix.
Location: 1.0 Ga Pikes Peak batholith, Little Patsy pegmatite, South Platte Pegmatite district, Jefferson County, Colorado, U.S.A.. Scale: See Image.
© Sarah L. Hansen

Samarskite-(Yb) Crystallography

Axial Ratios:

a:b:c =0.5736:1:0.5243

Cell Dimensions:

a = 5.688, b = 9.915, c = 5.199, Z = 4; beta = 93.16° V = 292.76 Den(Calc)= 7.08

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/c

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

By Intensity(I/I_o): 2.971(1), 3.07(0.25), 3.664(0.21),1.574(0.2), 1.87(0.2), 1.769(0.15),

Physical Properties of Samarskite-(Yb)

Cleavage:

None

Color:

Black.

Density:

7.03

Diaphaneity:

Nearly opaque

Fracture:

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

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

brown black

Optical Properties of Samarskite-(Yb)

Gladstone-Dale:

CI meas= 0.143 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.149 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1554,KPDmeas= 0.1565,KC= 0.1826
Ncalc = 2.28 - 2.29

Optical Data:

Isotropic, n=2.1.

Calculated Properties of Samarskite-(Yb)

Electron Density:

Bulk Density (Electron Density)=6.09 gm/cc
note: Specific Gravity of Samarskite-(Yb) =7.03 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_{Samarskite-(Yb)}= 847.13 barns/electron
U=PE_{Samarskite-(Yb)} x r_electron=5,162.49 barns/cc.

Radioactivity:

GRapi = 881,414.11 (Gamma Ray American Petroleum Institute Units)
Concentration of Samarskite-(Yb) per GRapi unit =1,134.54 (PPB)

Samarskite-(Yb) 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) 34.51 ± 8.63 grams of pure Samarskite-(Yb) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 3450.9 ±862.72 grams of pure Samarskite-(Yb) .

**Estimated Radioactivity from Samarskite-(Yb)** - 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 / 6.48 cm	21,352,266	5.77E-04	881,414.11	289.78
100 gm / 3.01 cm	2,135,227	5.77E-05	88,141.41	28.98
10 gm / 1.40 cm	213,523	5.77E-06	8,814.14	2.90
1 gm / 6.48 mm	21,352	5.77E-07	881.41	0.29
0.1 gm / 3.01 mm	2,135	5.77E-08	88.14	0.03
0.01 gm / 1.40 mm	214	5.77E-09	8.81	0.00
0.001 gm / 0.65 mm	21	5.77E-10	0.88	0.00

Weight of pure Samarskite-(Yb) in grams (gm) and Calculated Diameter of a Sphere with a Density of 7.03 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

Samarskite-(Yb) Classification

Dana Class:

08.01.11.02 (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

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-(Yb) Information

References:

NAME( CanMin, v44:1119) PHYS. PROP.(CanMin, v44:1119) OPTIC PROP.(CanMin, v44:1119)

See Also:

Links to other databases for Samarskite-(Yb) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Samarskite-(Yb) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Samarskite-(Yb) :

Ask about Samarskite-(Yb) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Samarskite-(Yb)

(Yb,Y,REE,U,Th,Ca,Fe++) (Nb,Ta,Ti)O4
Dana No: 08.01.11.02 Strunz No: 04.DB.25
Locality:

Notes:

Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.