Where it forms, where it's found
- Type locality
- Ytterby
- Resarö
- Vaxholm
- Stockholm County
- Sweden
59.4267°, 18.3533°
51recorded occurrences
Radioactivity
Physical
Optical
- Optical colour
- Light grayish brown
- Internal reflections
- Brown or yellowish gray
- Tropism
- Isotropic
Crystallography
- Cell parameters
- a = 5.34 Å · b = 10.94 Å · c = 5.07 Å
- Ratio a:b:c
- 1 : 2.049 : 0.949
- Morphology
Prismatic [001] with (110) and (010) prominent; also tabular (010).
- Comment
Metamict. Space group not determined.
Chemical composition
Synonyms
- Schwarzer Yttrotantalit
- Tantal oxidé yttrifère
- Yttroilmenite
- Yttrotantal
- Yttrotantaliet-(Y)
- Yttrotantalit
- Yttrotantalita
In other languages
- French
- Yttrotantalite · Yttrotantalite-
- German
- Yttrotantalit-(Y)
- Spanish
- Itrotantalita- · Itrotantalita-(Y)
- Italian
- Yttrotantalite- · yttrotantalite-(Y)
Classification
Strunz
10th ed.4.DG.10
- 4OxidesClass
- 4.DMetal: Oxygen = 1:2 and similarDivision
- 4.DGWith large (+- medium-sized) cations; chains of edge-sharing octahedraGroup
- 4.DG.10Yttrotantalite-(Y)Species
Dana
8th ed.08.01.03.01
- 08Multiple Oxides Containing Niobium, Tantalum or TitaniumClass
- 08.01ABO4Type
- 08.01.03Yttroantalalite-Yttrocolumbite SeriesGroup
- 08.01.03.01Yttrotantalite-(Y)Species
CIM
—18.4.3
- 18Niobates and TantalatesClass
- 18.4Niobates and tantalates containing both U and rare earthsGroup
- 18.4.3Yttrotantalite-(Y)Species
Group, growth & confusion
Literature, links & citation
Citations
- 1846Hermann (1846) Journal für praktische Chemie: 38: 119.
- 1944Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.
- 1957Ferguson, Robert Bury (1957) The crystallography of synthetic YTaO 4 and fused fergusonite. The Canadian Mineralogist, 6 (1). 72-77
- 1958Lima de Faria, J. (1958) Heat treatment of metamict euxenites, polymignites, yttrotantalites, samarskites, pyrochlores, and allanites. Mineralogical Museum, section of the Junta de Investigações do Ultramar: 3R: 937-942.
- 1967Wolten, G. M. (1967) The structure of the M'-phase of YTaO4, a third fergusonite polymorph. Acta Crystallographica, 23 (6) 939-944 doi:10.1107/s0365110x67004098DOI: 10.1107/s0365110x67004098
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Yttrotantalite-(Y) — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/yttrotantalite-y-4373},
note = {Accessed 2026-05-11}
}