author(s) : Hawkes, Merriman, Harding and Darbyshire
date of publication : 1975
source : in R.K.Harrison, Expedition to Rockall, 1971-1972. Rep.Inst.Geol.Sci. No75/1
formula : BaZrSi3O9
comments about the origin : Hawkes, 1978
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP