** Shares of world's largest producer of lithium Albemarle ALB.N drop 2.3% to $171.40 in premarket trade
** ALB says it would idle a major Australian processing plant
** Posts larger-than-expected quarterly loss; Alb lost 53 cents per share vs analysts' expected a loss of 41 cents per share, according to data compiled by LSEG
** Lithium prices plunged more than 90% over the past two years due in part to oversupply from China
** So far this year, ALB is up 24%
(Reporting by Arunima Kumar in Bengaluru)
((Arunima.Kumar@thomsonreuters.com; Twitter: https://twitter.com/Aru_Kumar94))