Bulk chemistry and mineralogy of the peculiar rock of Ricetto (Carseolani Mts  Central Apennines  Italy) was studied to resolve its controversial origin: igneous dyke or anthropic product This hybrid rock consists of a colorless  felsic component made up of glass plus quartz  and a brown  femic component made up of fans and spherulites of diopside  calcic plagioclase  wollastonite  and melilite