Keyword "TRACHYTE" in:

Phonolite and trachyte dykes on Huseň Hill in the Doupovské hory Mts.
Vladislav Rapprich, Zoltán Pécskay, Jan Matějů, volume 52, issue 1, 2019, pages 11–16
pdf (7.45 MB)

New finds of cavity minerals during the mining of neovolcanic rocks, Mariánský vrch in Ústí nad Labem (N-Bohemia)
Vlačiha,V., volume 31, 1998 (GRR for 1997), pages 129–129
pdf (0.06 MB)