San Cristobal Mine, San Cristobal mining district, Yauli District, Yauli Province, Junín, Peru
Large botryoidal masses up to several kg in weight were collected from 1978 to 1980. When cut open, these siderites display a concentric pattern. This material has not been found for a long time.Ref: J. Hyrsl (2012) Gemstones of Peru, p. 74