abstract:Akdalaite is a very rare mineral found in Kazakhstan and has the formula 5Al2O3·H2O.A New Occurrence and New Data on Akdalaite, a Retrograde Mineral from UHP Whiteschist, Kokchetav Massif, Northern Kazakhstan, Shyh-Lung Hwang, Pouyan Shen, Hao-Tsu Chu, Tzen-Fu Yui, International Geology Review, 48, 8, 2006, 754-764, It was formerly believed to be 4Al2O3·H2O.