The natural tendency in classifying pegmatites is to use the same nomenclature as is used in rock classification, with (in the case of the pegmatites producing rare minerals) a sub-classification based upon the prevailing type of minerals present. Such classifications have been made by Harker105 and Palache.106 Lacroix107 has developed a chemical classification which is followed by some. An interesting genetic classification has been recently published by Piatnitsky.108 It follows:

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