Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Samarskite-(Yb)

This page is currently not sponsored. Click here to sponsor this page.
Formula:
(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
simplified formula given as (Yb,Y,REE,U,Th,Ca,Fe2+)(Nb,Ta,Ti)O4;
ideal formula also given as YbNbO4
System:
Monoclinic
Colour:
black
Hardness:
5 - 6
Samarskite Group. The Yb analogue of Samarskite-(Y). Unique combination of elements. One of just a few known Yb-dominant minerals, the other being keiviite-(Yb), hingganite-(Yb), xenotime-(Yb), and 'hellandite-(Yb)'.


Classification of Samarskite-(Yb)

Approved
Approval Year:
2004
4.DB.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra

Type Occurrence of Samarskite-(Yb)

General Appearance of Type Material:
anhedral metamict masses, up to tens of cms in size, intergrown with columbite-(Fe) and zircon
Place of Conservation of Type Material:
the Smithsonian Institution (catalog no. NMNH 174442)
Geological Setting of Type Material:
late-stage replacement units at the contact between core and margin of a pegmatite

Physical Properties of Samarskite-(Yb)

Vitreous
Diaphaneity (Transparency):
Opaque
Colour:
black
Comment:
nearly opaque
Streak:
brown to black
Hardness (Mohs):
5 - 6
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
7.03(1) g/cm3 (Measured)    7.079 g/cm3 (Calculated)
Comment:
measured density: unheated sample; calculated one: basing on the empirical formula

Crystallography of Samarskite-(Yb)

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Space Group Setting:
P2/c
Cell Parameters:
a = 5.688(9) Å, b = 9.915(2) Å, c = 5.199(9) Å
β = 93.16(10)°
Ratio:
a:b:c = 0.574 : 1 : 0.524
Unit Cell Volume:
V 292.76 ų
Z:
4
Twinning:
not observed
Comment:
must have been heated to restore the structure; the above parameters are after heating to 1100oC for 12 hours
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.664(21)
3.086(25)
2.981(100)
1.895(12)
1.865(20)
1.769(15)
1.746(12)
1.587(20)
Comments:
From type description (heated sample)

Optical Data of Samarskite-(Yb)

Type:
Isotropic
RI values:
n = > 2.1
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemical Properties of Samarskite-(Yb)

Formula:
(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8

simplified formula given as (Yb,Y,REE,U,Th,Ca,Fe2+)(Nb,Ta,Ti)O4;
ideal formula also given as YbNbO4
Idealised Formula:
(Yb,Fe3+)2(Nb,Ta)2O8
All elements listed in formula:
Analytical Data:
Electron microprobe, wt.%
Nb2O5 29.53
Ta2O5 15.13
TiO2 0.64
ThO2 10.11
UO2 10.39
La2O3 0.03
Ce2O3 0.22
Pr2O3 0.05
Nd2O3 0.64
Sm2O3 0.42
Gd2O3 0.55
Tb2O3 0.25
Dy2O3 3.16
Ho2O3 0.59
Er2O3 3.40 
Tm2O3 0.58
Yb2O3 5.78
Lu2O3 0.97
Y2O3 1.92
MnO 1.02
ZrO2 0.98
CaO 2.11
Sc2O3 0.26
SnO2 0.54
PbO 0.27
WO3 2.96
FeO 2.55
SiO2 0.41

total 95.37 
Empirical Formula:
([Yb0.096Er0.058Y0.056Dy0.054Lu0.016Nd0.012Tm0.010Ho0.010Gd0.010Sm0.008Tb0.005Ce0.004Pr0.001La0.001]∑0.341U0.126Th0.125Ca0.123Fe0.1162+Mn0.047W0.042Zr0.026Si0.022Sc0.012Sn0.012Pb0.004)∑0.996(Nb0.728Ta0.224Ti0.027)∑0.979O4
Common Impurities:
U,Th,Ca,Fe(II),Ta,Er,Y,Dy

Relationship of Samarskite-(Yb) to other Species

Other Members of Group:
Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8
IshikawaiteU4+Fe2+Nb2O8
Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
SrilankiteZrTi2O6
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
4.DB.10OrdoñeziteZnSb2O6
4.DB.15bAkhtenskiteε-Mn4+O2
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2
4.DB.15aParamontroseiteV4+O2
4.DB.15aRamsdelliteMn4+O2
4.DB.20Scrutinyiteα-PbO2
4.DB.25IshikawaiteU4+Fe2+Nb2O8
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.25SrilankiteZrTi2O6
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8
4.DB.30FerberiteFeWO4
4.DB.30HübneriteMnWO4
4.DB.30Sanmartinite(Zn,Fe)WO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)FeNb2O6
4.DB.35Tantalite-(Fe)FeTa2O6
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
4.DB.35Tantalite-(Mn)MnTa2O6
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]
4.DB.55AlumotantiteAlTaO4
4.DB.60Biehlite((Sb,As)O)2[MoO4]

Other Names for Samarskite-(Yb)

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Samarskite-(Yb)

Reference List:
HANSON, Sarah L., SIMMONS, William B., and FALSTER, Alexander U., (2004) SAMARSKITE-(YB): A NEW MINERAL INDICATING EXTREME HREE ENRICHMENT IN THE SOUTH PLATTE NYF PEGMATITE DISTRICT, COLORADO GSA 2004 Denver Annual Meeting (November 7–10, 2004)

Internet Links for Samarskite-(Yb)

mindat.org URL:
http://www.mindat.org/min-27449.html
Please feel free to link to this page.

Localities for Samarskite-(Yb)

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
USA (TL)
 
  • Colorado
    • Jefferson Co.
      • South Platte Pegmatite District
Minerals of Colorado (1997) E.B. Eckels; Simmons W B, Hanson S H, Falster A U (2006) Samarskite-(Yb): a new species of the samarskite group from the Little Patsy pegmatite, Jefferson County, Colorado, The Canadian Mineralogist 44, 1119-1125
  • Montana
    • Carbon Co.
Anita Moore-Nall and David R. Lageson (2015) Elevated REE in Ore Minerals of the Pryor Mountain Mining District, South Central Montana. 2015 Mining and Mineral Symposium, Montana Bureau of Mines and Geology pp47-49.
Anita Moore-Nall and David R. Lageson (2015) Elevated REE in Ore Minerals of the Pryor Mountain Mining District, South Central Montana. 2015 Mining and Mineral Symposium, Montana Bureau of Mines and Geology pp47-49.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2016, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 9, 2016 19:24:40 Page generated: November 24, 2016 13:56:00
Go to top of page