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ancylite
Ancylite is a group of hydrous strontium carbonate minerals containing cerium, lanthanum and minor amounts of other rare earth elements. The composition is Sr(Ce,La)(CO3)2(OH)·H2O with ancylite-Ce enriched in cerium and ancylite-La in lanthanum.〔http://webmineral.com/data/Ancylite-(Ce).shtml Webmineral data Ancylite-Ce〕〔http://www.handbookofmineralogy.org/pdfs/ancylitela.pdf Handbook of Mineralogy〕 Ancylite was first described in 1899 for an occurrence in the Narsarsuk pegmatite in west Greenland and named from the Greek αυκιλος for ''curved'' in reference to its rounded or distorted crystal form.〔〔http://www.mindat.org/min-216.html Mindat〕 ==References==
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