Mineralpedia Details for Tadzhikite-(Ce)
Named for its type occurrence in Tajikistan, sometimes spelled Tadzhikistan as translated from Russian, Tadzhikite was originally thought to be yttrium dominant, but is, in fact, cerium dominant; however Tadzhikite can still be found to be called and labeled as Tadzhikite-(Y) instead of Tadzhikite-(Ce). Tadzhikite occurs at its type locality within replacement zones in pegmatitic dikes. It occurs in only four countries: Tajikistan, Italy, Norway, and Canada.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/tadzhikite-(Y).pdf