1) Bastnaesite 2) Gemstone 3) Mineral 1) Bastnaesite 
The mineral bastnäsite (or bastnaesite) is one of a family of three carbonate-fluoride minerals, which includes bastnäsite-(Ce) with a formula of (Ce, La)CO3F, bastnäsite-(La) with a formula of (La, Ce)CO3F, and bastnäsite-(Y) with a formula of (Y, Ce)CO3F. Most bastnäsite is bastnäsite-(Ce), and cerium is by far the most common of the rare ...
[n] - a yellow-to-brown mineral that is a source of rare earth elements
bastnaesite noun a yellow-to-brown mineral that is a source of rare earth elements