rare
131rare´ness — rare1 «rair», adjective, rar|er, rar|est. 1. seldom seen or found: »Peacocks and storks are rare birds in the United States. The three o clock in the morning courage which Bonaparte thought was the rarest (Thoreau) …
132Rare-earth mineral — A rare earth mineral is a mineral whose principal element is a rare earth element. Yttrium is found in almost all rare earth minerals. Rare earth minerals are usually found in association with alkaline to per alkaline igneous complexes, in… …
