author(s) : Safiannikoff and Van Wambeke
date of publication : 1961
source : Bull.Soc.Fr.Min.Crist.(84) p.382
formula : (Pb,..)(Ta,Nb,Ti)2 O6(O,OH)
comments about the origin : Van Wambeke 1966,1973,1978
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP