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The name is derived from the Greek word lanthanein, "to be hidden," because the element was discovered "hidden" as an impurity in ores of cerium.
Aluminium 's is Lr The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A. Zircon is not as reactive as monazite during metamorphism reaction and better in recording igneous events cooling U th pb dating of phosphate minerals. A single monazite grain can contain domains of distinctively different compositions and ages. These domains are widely accepted to represent episodes in geological history during monazite growth or recrystallisation. The age of the event is thus represented by the domain age.
The ideal formula of monazite is [LREE PO4 ], the variation in composition is mainly due to the chemical substitutions of light rare earth elements REE in monazite by other elements. Since all three minerals share the same chemical structure, they are the three endmembers in their solid solutionmeaning that they appear in a same solid phase where substitutions happen. It is important to note that the composition zonation pattern may not be the same when we are considering different elements. And age zonation may have no relationship with composition zonation at all. In natural monazite, the zonation pattern maybe complex and hard to interpret.
Below we describe some simple chemical zonation patterns and the associated interpretations. Zonation patterns associated with igneous activity are usually easy to interpret. However, those associated with metamorphism are more complicated.
mineras Intensity of colour represents concentration of certain element. Edited after Williams,  One of the monazite formations is crystallization of an igneous melt. The concentric zoning pattern reflects the changing composition of the melt which affect the crystallising composition of monazite. However, some elements may have a tendency to crystallise onto a specific crystal face. Kohn, John Rakovan, and John M. Council suggested that they join forces. Thus this volume, Phosphates: Geochemical, Geobiological, and Materials Importance, was organized.
It was prepared in advance of a short course of the same title, sponsored by MSA and presented at Golden, Colorado, October We are pleased to present this volume entitled Phosphates: Geochemical, Geobiological and Materials Importance. Phosphate minerals are an integral component of geological and biological systems.
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