author(s) : Jaeger, Niggli and Van de Veen
date of publication : 1959
source : Min.Mag.(32) p.10
formula : (Ba,Sr)2 (Nb,Ti)2 (O,OH)7
comments about the origin : Van de Veen 1965
catalog number(s) : 14098,14099,14100,14101,14102,14103
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP