Miyawaki, Ritsuro Department of Geology, National Science Museum, Tokyo, Japan.
- Crystal structure
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Naturally occurring solids, formed by geological processes, that contain the rare-earth elements—the lanthanides (atomic numbers 57–71) and yttrium (atomic number 39)—as essential constituents. In a rare-earth mineral, at least one crystallographic site contains a total atomic ratio of lanthanides and yttrium that is greater than that of any other element. The mineral name generally has a suffix, called a Levinson modifier, indicating the dominant rare-earth element; for example, monazite-(La) [LaPO4] contains predominantly lanthanum, and monazite-(Ce) [CePO4] contains predominantly cerium. See also: Mineral; Monazite; Periodic table; Rare-earth elements
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