Wikipedia
Aeschynite-(Ce) (or Aschynite, Eschinite, Eschynite) is a rare earth mineral of cerium, calcium, iron, thorium, titanium, niobium, oxygen, and hydrogen with formula: (Ce,Ca,Fe,Th)(Ti,Nb)(O,OH). Its name comes from the Greek word for "shame". The "-(Ce)" means it has more cerium than the yttrium variety aeschynite-(Y). Its Mohs scale rating is 5-6.
Aeschynite-(Nd) is a rare earth mineral of neodymium, cerium, calcium, thorium, titanium, niobium, oxygen, and hydrogen with formula: (Nd,Ce,Ca,Th)(Ti,Nb)(O,OH). Its name comes from the Greek word for "shame". Its Mohs scale rating is 5 to 6.
It was first reported for an occurrence in Bayan Obo Inner Mongolia in 1982. In that rare earth mining deposit it occurs in veins within metamorphosed dolomite and slate. It occurs associated with aegirine, riebeckite, barite, fluorite, albite, phlogopite and magnetite.