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Brown-black to black
5 - 5½
Named after its chemical composition containing yttrium and its similarity to Tantalite.
A member of the Samarskite Group according to Ercit (2005).

See also Iwashiroite-(Y) and Formanite-(Y).

Classification of Yttrotantalite-(Y)

Approved, 'Grandfathered' (first described prior to 1959)

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

1 : ABO4

18 : Niobates and Tantalates
4 : Niobates and tantalates containing both U and rare earths URL:
Please feel free to link to this page.

Type Occurrence of Yttrotantalite-(Y)

Physical Properties of Yttrotantalite-(Y)

Vitreous, Greasy, Sub-Metallic
Brown-black to black
Hardness (Mohs):
5 - 5½
On {010}.
5.5 - 5.9 g/cm3 (Measured)    

Crystallography of Yttrotantalite-(Y)

Crystal System:
Cell Parameters:
a = 5.34Å, b = 10.94Å, c = 5.07Å
a:b:c = 0.488 : 1 : 0.463
Unit Cell Volume:
V 296.19 ų (Calculated from Unit Cell)
Prismatic [001] with {110} and {010} prominent; also tabular {010}.
Metamict. Space group not determined.
X-Ray Powder Diffraction Data:
2.95 (10)
2.56 (6)
1.81 (9)
1.55 (9)
1.183 (6)
1.152 (6)
1.053 (5)
After heating at 1000°C for one hour.

Optical Data of Yttrotantalite-(Y)


Chemical Properties of Yttrotantalite-(Y)

All elements listed in formula:
Common Impurities:

Relationship of Yttrotantalite-(Y) to other Species

4.DG.05Kobeite-(Y)(Y,U)(Ti,Nb)2(O,OH)6 (?)
4.DG.05Loranskite-(Y)(Y,Ce,Ca)ZrTaO6 (?)
18.4.1Uranpyrochlore (of Hogarth 1977)(U,Ca,Ce)2(Nb,Ta)2O6(OH,F)
18.4.7Kobeite-(Y)(Y,U)(Ti,Nb)2(O,OH)6 (?)
18.4.9Yttropyrochlore (of Hogarth 1977)
18.4.10Calciobetafite (of Mazzi & Munno)
18.4.11Yttrobetafite (of Hogarth 1977)

Other Names for Yttrotantalite-(Y)

Name in Other Languages:

Other Information

Health Risks:

References for Yttrotantalite-(Y)

Reference List:
Hermann (1846), Journal. pr. Chem.: 38: 119.

Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 763-766.

Canadian Mineralogist (1957): 6: 72.

Mineralogical Magazine (1958): 31: 937.

Wolten, G.M. (1967) The structure of the M'-phase of YTaO4, a third fergusonite polymorph. Acta Crystallogr., 23, 939-944.

Ercit, T.S. (2005): Identification and alteration trends of granitic–pegmatite-hosted (Y,REE,U,Th)–(Nb,Ta,Ti) oxide minerals: a statistical approach. Can. Mineral. 43, 4 1291-1303.

Internet Links for Yttrotantalite-(Y)

Localities for Yttrotantalite-(Y)

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.
  • Queensland
    • Cloncurry Shire
      • Rosebud Station
        • Mary Kathleen district
T.Kwak & P.Abeysinghe: "Rare earth and uranium minerals present as daughter crystals in fluid inclusions, Mary Kathleen U-REE skarn, Queensland, Australia: Mineralogical Magazine 51,665-670(1987)
  • Western Australia
    • East Pilbara Shire
Sue Koepke collection
Pegmatites of Western Australia; M Jacobson, M Calderwood, B Grguric; Hesperian Press, Perth 2007
Pegmatites of Western Australia; M Jacobson, M Calderwood, B Grguric; Hesperian Press, Perth, 2007.
  • Manitoba
    • Bird River Greenstone Belt
Morgan Masau, Petr Cerny and Ron Chapman (2000) Exsolution of zirconian-hafnian wodginite from manganoan-tantalian cassiterite, Annie Claim #3 granitic pegmatite, southeastern Manitoba, Canada. The Canadian Mineralogist, 38:685-694.
  • Ontario
    • Nipissing District
      • Mattawan Township
  • Saxony
    • Oberlausitz
      • Görlitz
        • Thiemendorf
Witzke, T. & Giesler, T. (2013): Eine Seltenerd- und Niob-Tantal-Mineralisation aus dem Königshainer Granit in der Lausitz, Sachsen.- Mineralien-Welt 24(1), 36-45
  • Honshu Island
    • Kinki Region
      • Shiga Prefecture
        • Otsu City
Nagashima & Nagashima (1960) Nihon Kigenso Koubutsu, 230-231.
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
    • Tohoku Region
      • Fukushima Prefecture
        • Kawamata
          • Iizaka Village (Iisaka)
Van King specimen
        • Sukagawa City
University of Tokyo collection
  • Aust-Agder
    • Arendal
      • Stokken
        • Helle
Andersen, O. (1931): Feltspat II. Forekomster i fylkene Buskerud og Telemark, i flere herreder i Aust-Agder og i Hidra i Vest-Agder. Norges Geologiske Undersøkelse 128b,1-109 [p.76]
    • Evje og Hornnes
      • Vardeheia
Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68, 278 pp. p. 81
    • Froland
      • Mykland
Rosenqvist, I.Th. (1949): Samarskit-yttrotantalit ved Bjortjenn i Mykland herred. Norsk Geologisk Tidsskrift. 28, 40-43
Nilssen, B.(1962): Ny lokalitet for yttrotantalitt. in Geologisk Museum. Interne notater 1961-1990. Published by Geologisk Museums Venner, Oslo 1991, p 8; Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68, p.81
    • Iveland
      • Ljosland
Bjørlykke (1934, p. 262); Neumann (1985) : Norges mineraler. Norges geologiske undersøkelse Skrifter 68, p. 81).; Bjørlykke, H. (1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
Bjørlykke, H. (1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
      • Rossås (Rosås)
Bjørlykke, H.( 1934): The Mineral Paragenesis and Classification of the Granite Pegmatites of Iveland, Setesdal, Southern Norway. Norsk Geologisk Tidsskrift 14, 211-311
Frigstad, O. F. (1968): En undersøkelse av cleavelandittsonerte pegmatittganger i Iveland-Evje, Nedre Setesdal. Hovedfagsoppgave (Thesis), University of Oslo p. 148
  • Østfold
    • Moss
      • Dillingøya (Dillingö)
Bjørlykke, H. (1939): Feltspat V. De sjeldne mineraler på de norske granittiske pegmatittganger. Norges Geologiske Undersøkelse. 154. 77p. (p.35)
Brøgger, W.C. (1906): Die Mineralien der Südnorwegischen Granitpegmatitgänge, I. Niobate, tantalate, titanate und titanoniobate. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1906, 6. 1-162 [p.152]
    • Råde
Brøgger, W.C. (1906): Die Mineralien der Südnorwegischen Granitpegmatitgänge, I. Niobate, tantalate, titanate und titanoniobate. Videnskapsselskapets Skrifter. I.Mat-Naturv. Klasse 1906, 6. 1-162 [p. 50]
  • Telemark
    • Drangedal
      • Tørdal
Raade, G. & Kristiansen, R. (2000a): Mineralogy and geochemistry of the Heftetjern granite pegmatite, Tørdal: a progress report. Norsk Bergverksmuseum Skrifter. 17, 19-25
Oftedal, I. (1942): Lepidolit-og tinnsteinsførende pegmatitt i Tørdal, Telemark. Norske Geologisk Tidsskrift 22: 1-14; Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68 pp. 80-81
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
South Korea
  • Chungcheongnam-do (Ch'ungch'ong-namdo; Chungcheongnamdo)
    • Hongsong-gun
Hideo Tsuda (1969) Supplement to "Minerals of Korea".
  • Bohuslän
    • Orust
  • Dalarna
    • Borlänge
      • St. Tuna
Brotzen 1959, GFF 81, p. 285
    • Falun
Geologiska Föeningens I Stockholm. Förhandlinger, Stockholm: 1, 119.
Berzelius, J.J. (1815): Afhandl. Fys. Kem. Min., 4, 262-93.; Kjellman (unpublished)
GFF 1, 119
Brotzen 1959, GFF 81, p. 286
Brotzen 1959, GFF 81, p. 286
    • Ludvika
      • Grängesberg
Brotzen 1959, GFF 81, p. 286
    • Säter
      • St. Skedevi
No reference listed
  • Småland
    • Vetlanda
      • Alseda
        • Slättåkra
H.-J.Wilke: Die Mineralien und Fundstellen von Schweden.1997
Swedish Nat.Musuem
  • Uppland
    • Norrtälje
      • Väddö
Wilke, H.-J. (1997): Die Mineralien und Fundstellen von Schweden. Chr. Weise Verlag, München, 200 pp. (in German)
    • Österåker
Nysten, P. (1996): Paragenetic setting and crystal chemistry of milarites from Proterozoic granitic pegmatites in Sweden. Neues Jahrbuch für Mineralogie, Monatshefte 1996, 564-576.
    • Vaxholm
The Swedish Museum of Natural History collection # 19170504 (Axel Lindströms mineral collection)
      • Resarö
[MinRec 2:137-138]; Ekeberg, KVA 1802, 68-83.
  • Värmland
    • Filipstad
      • Persberg District
        • Kroppa
No reference listed
  • Västergötland
    • Ale
      • Nödinge
Natural History Museum, Stockholm collection, inventory # g31354
    • Vänersborg
      • Väne Ryr
Brotzen GFF 1961; Heinrich 1960, AZ Bur. of Mines Bull. 167: 12-18. Kjellman (unpublished data); Wallerius, I. D. (1932): Omvandlad pyrofysalit. Geologiska Föreningen i Stockholm Förhandlingar. 54, 279-280
  • Arizona
    • Mohave Co.
      • Aquarius Mts (Aquarius Range; Peacock Range)
Heinrich, E. Wm. (1960), AZ Bur. of Mines Bull. 167: 12-18; Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 429; Encyclopedia of Minerals, 2nd. ed.: 965.; Hanson, S.L., Simmons, W.B., Falster, A.U. (2006) 33rd Rochester Mineralogical Symposium, abstracts, 18-19.; Brown, TJ, "Geology & Geochemistry of the Kingman Feldspar, Rare Metals and Wagon Bow Pegmatites" (2010). University of New Orleans Theses and Dissertations. Paper 1280.
  • Colorado
    • El Paso Co.
Rocks & Minerals (Sept. 2001)
    • Fremont Co.
      • Kuntz Gulch
Minerals of Colorado (1997) E.B. Eckels
    • Jefferson Co.
      • Clear Creek pegmatite Province
Minerals of Colorado (1997) Eckels, E. B.
      • South Platte Pegmatite District
Mineralogical Record: 21: 429.
    • Park Co.
Minerals of Colorado (1997) E.B. Eckels
    • Teller Co.
Seaman (1976) Pegmatite Minerals of the World.
Minerals of Colorado (1997) E.B. Eckels
  • New Mexico
    • Rio Arriba Co.
Northrop, Minerals of New Mexico, 3rd rev. Ed., 1996
        • Alamos area
Minerals of New Mexico 3rd ed.
        • Cribbenville area
Minerals of New Mexico 3rd ed.
        • La Jarita-Apache area
Minerals of New Mexico 3rd ed.
Minerals of New Mexico 3rd ed.
    • San Miguel Co.
Northrop, Minerals of New Mexico, 3rd rev. ed, 1996
Genth,F.A and Kerr,W.C,1881,Minerals and Mineral Localities of North Carolina,Geologic Survey,N.C
  • Midlands
    • Kwekwe District (Que Que District)
Gallagher, M.J. (1967): Phosphates and other minerals in pegmatites of Rhodesia and Uganda. Mineralogical Magazine. 36, 50-59
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