noun. A fluocarbonate of cerium, lanthanum, and didymium from the Bastnäs mine, Sweden. It also occurs as an alteration product of tysonite near Pike's Peak, Colorado.

noun. A light brown mineral that is a source of many rare earth elements

noun. a yellow-to-brown mineral that is a source of rare earth elements

"This underlines the need for new producers with mineral resources having an REE distribution that is more reflective of current market demand, such as that indicated for the bastnasite-group minerals at Bear Lodge."

mineral