Chemistry:Oxyyttropyrochlore-(Y)

Oxyyttropyrochlore-(Y) (obruchevite)

Oxyyttropyrochlore-(Y), also referred to as "obruchevite" or "yttropyrochlore-(Y)", is a potential (not yet accepted) zero-valent-dominant mineral of the pyrochlore group. Its formula can be written as (Y,◻)₂Nb₂O₂O.

The name "yttropyrochlore-(Y)" for this compound was used by Kalita (1957), and Ercit et al. (2003), but it has become obsolete and the mineral status is not yet clear. 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". The Canadian Mineralogist. pp. 673–698. http://pubsites.uws.edu.au/ima-cnmnc/Atencio%20et%20al%20pyrochlore%20nomenclature.pdf.  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" (in Russian). Doklady Akademii Nauk SSSR 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.