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a borate of tantalum TaBO4, which has ben found so far only in Madagascar, and whose crystal structure type is that of zircon; recently, the niobium equivalent of behierite (NbBO4) has also been discovered in Madagascar
The authors are grateful to F.J. Spera (Univ. California Santa Barbara, USA) and H.E. Belkin (USGS, Reston, VA, USA) for their critical comments and suggestions. Author information Authors and Affiliations Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università di Nap...