Obruchevite

Oxyyttropyrochlore-(Y) (obruchevite)

Obruchevite, also known as Yttropyrochlore-(Y), is a zero-valent-dominant mineral of the pyrochlore group. Its formula can be written as (Na,Ca,Fe,Y,U)₂(Nb,Ti,Ta)₂(O,OH)₇, or (Y,U,Ca)₂Nb₂O₆ (OH), or YNb₂O₆OH.

The name "Yttropyrochlore-(Y)" for this compound was used by Kalita (1957), and Ercit et al. (2003), but it has now become obsolete and will be discarded. The Yttropyrochlore-(Y) as mentioned by Tindle & Breaks (1998) is in fact oxyyttropyrochlore-(Y).

References

• Atencio, Daniel; Andrade, Marcelo B.; Christy, Andrew G.; Gieré, Reto; Kartashov, Pavel M. (2010). "The Pyrochlore Supergroup of Minerals: Nomenclature" (PDF). The Canadian Mineralogist. pp. 673–698.  Citing:
  • Ercit, T.S.; Groat, L.A.; Gault, R.A. (2003). "Granitic pegmatites of the O’Grady batholith, N.W.T., Canada: a case study of the evolution of the elbaite subtype of rare-element granitic pegmatite". The Canadian Mineralogist. 41: 117–137. doi:10.2113/gscanmin.41.1.117. 
  • Kalita, A.P. (1957). "On the composition of obruchevite – a hydrated uranium–yttrium variety of pyrochlore". Doklady Akademii Nauk SSSR (in Russian). 117: 117–120. 
  • Tindle, A.G.; Breaks, F.W. (1998). "Oxide minerals of the Separation Rapids rare-element granitic pegmatite group, northwestern Ontario". The Canadian Mineralogist. 36: 609–635.