Комиссия IMA по новым минералам и названиям минералов: нормы и рекомендации по номенклатуре минералов, 1998 Редкоземельные минералы

The name of a mineral with essential rare-earth elements (REE), or the chemically related elements Y or Sc, must have a suffix indicating the dominant rare-earth element, e.g., bastnäsite-(Ce); if a new mineral is discovered with the same structure and analogous composition, but with a different dominant rare-earth element, it should be given a name that is analogous to that of the existing mineral, e.g., bastnäsite-(Y). A suffix of this type is known as a Levinson modifier after the person who introduced this procedure (Levinson 1966). A subsequent clarification (Bayliss & Levinson 1988) specifies that more than one chemical symbol may be appended only if the elements occupy different crystal-structure sites. A compilation of rare-earth minerals, appropriately suffixed, was given as an Appendix to Nickel & Mandarino (1987).

  An example of a situation that may arise is one in which a mineral with a particular structural site is occupied by both Ca and REE, and the sum of REE elements (in molar proportions) is greater than that of Ca, but individual REE elements are subordinate to that of Ca. In such a case, the mineral is regarded as a rare-earth mineral, with a Levinson modifier specifying the predominant REE.


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