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Samarskite-(Yb)

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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
Colour:
black
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
7.03
Crystal System:
Monoclinic
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)'.


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Classification of Samarskite-(Yb)Hide

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

Physical Properties of Samarskite-(Yb)Hide

Vitreous
Transparency:
Opaque
Colour:
black
Comment:
nearly opaque
Streak:
brown to black
Hardness:
5 - 6 on Mohs scale
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

Optical Data of Samarskite-(Yb)Hide

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)Hide

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
IMA Formula:
YbNbO4
Idealised Formula:
(Yb,Fe3+)2(Nb,Ta)2O8
Common Impurities:
U,Th,Ca,Fe(II),Ta,Er,Y,Dy

Crystallography of Samarskite-(Yb)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
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 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 DiffractionHide

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)

Type Occurrence of Samarskite-(Yb)Hide

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
Associated Minerals at Type Locality:

Synonyms of Samarskite-(Yb)Hide

Other Language Names for Samarskite-(Yb)Hide

Relationship of Samarskite-(Yb) to other SpeciesHide

Other Members of this group:
Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
IshikawaiteU4+Fe2+Nb2O8Mon.
Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
SrilankiteZrTi2O6Orth. mmm (2/m 2/m 2/m) : Pbcn

Common AssociatesHide

Associated Minerals Based on Photo Data:
Columbite-(Fe)2 photos of Samarskite-(Yb) associated with Columbite-(Fe) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.DB.05ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
4.DB.05PyrolusiteMnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05TripuhyiteFe3+Sb5+O4Tet.
4.DB.05TugarinoviteMoO2Mon.
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10OrdoñeziteZnSb2O6Tet.
4.DB.15bAkhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2Hex.
4.DB.15aParamontroseiteV4+O2Orth.
4.DB.15aRamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
4.DB.20Scrutinyiteα-PbO2Orth.
4.DB.25IshikawaiteU4+Fe2+Nb2O8Mon.
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25SrilankiteZrTi2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
4.DB.30FerberiteFeWO4Mon. 2/m : P2/b
4.DB.30HübneriteMnWO4Mon. 2/m : P2/b
4.DB.30Sanmartinite(Zn,Fe)WO4Mon. 2/m : P21/b
4.DB.30KrasnoselskiteCoWO4Mon.
4.DB.30HeftetjerniteScTaO4Mon. 2/m
4.DB.30HuanzalaiteMgWO4Mon. 2/m : P2/b
4.DB.35Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8Mon.
4.DB.40LithiotantiteLiTa3O8Mon.
4.DB.40LithiowodginiteLiTa3O8Mon.
4.DB.40TitanowodginiteMn2+TiTa2O8Mon.
4.DB.40WodginiteMn2+Sn4+Ta2O8Mon.
4.DB.40FerrotitanowodginiteFe2+TiTa2O8Mon.
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)Mon.
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]Mon. 2/m : P21/b
4.DB.55AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.60Biehlite((Sb,As)O)2[MoO4]Mon.

Fluorescence of Samarskite-(Yb)Hide

non-fluorescent

Other InformationHide

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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)Hide

Localities for Samarskite-(Yb)Hide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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  
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