Samarskite-(Yb) Mineral Data

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

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 - PrismaticH-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) :

B and L Fine Minerals Google Search for Samarskite-(Yb)
Dakota Matrix Minerals Google Search for Samarskite-(Yb)
Dan & Diana Weinrich Mineral Auctions Google Search for Samarskite-(Yb)
Diamonds Pro Google Search for Samarskite-(Yb)
Excalibur Mineral Corp. Google Search for Samarskite-(Yb)
Exceptional Minerals Google Search for Samarskite-(Yb)
FEI QEMSCAN SEM Website Link
FEI Natural Resources Website Link
John Betts Fine Minerals Google Search for Samarskite-(Yb)
Mineral News Website Link
Mineral of the Month Club Google Search for Samarskite-(Yb)
Rockeeper Website Link
TIMA Mineral Analyzer Website Link
Weinrich Minerals, Inc. Google Search for Samarskite-(Yb)
Wright's Rock Shop Google Search 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: