| Domain | Definition | ||
| Mining | An orthorhombic mineral, (Ca, Ce, Na)(Nb, Ta, Ti)2 (O, OH, F)6; weakly radioactive; in syenites, may be associated with pyrochlore, alkali hornblende, apatite, sphene, magnetite, zircon, xenotime, or allanite; also in some marbles with columbite and monazite. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
